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Humpback Whale Breaching
Photograph courtesy NOAA
Scientists aren't sure why whales breach. Some say it's to clean off parasites. Others say it's just for fun.
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Northern Right Whale
Photograph courtesy NOAA
Northern right whales, hunted to near extinction, are the rarest of all large whales. Experts estimate that only several hundred exist in the wild.
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Sunlight Illuminates a Sperm Whale
Photograph by Brian J. Skerry
Sperm whales' heads are filled with a mysterious substance called spermaceti. Scientists have yet to understand its function, but believe it may help the animal regulate its buoyancy.
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Killer Whale Breaching
Photograph by Gerard Lacz/Animals Animals—Earth Scenes
Largest of the dolphins, the killer whale, or orca, is a highly successful predator, feeding on fish, seals, and sometimes whales.
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Gray Whale in Grice Bay
Photograph by Flip Nicklin
Every year, in late fall, gray whales leave their feeding grounds in Alaska to breed in the warm waters off Mexico's west coast. They return north in the summer, a round trip of some 12,500 miles (20,116 kilometers)!
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Humpback Whales in Singing Position
Photograph courtesy Dr. Louis M. Herman/NOAA
The plaintive song of the humpback whale can travel for great distances underwater.
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Northern Right Whale on the Surface
Photograph courtesy NOAA
The white bumps on a right whale's head are skin abrasions called callosities. Extensive hunting has dramatically reduced this whale's numbers, and estimates are that only about 300 remain in the North Atlantic.
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Beluga Whale Swimming
Photograph by Brian J. Skerry
The beluga, or white whale, is one of the smallest species of whale. Their distinctive color and prominent foreheads make them easily identifiable.
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Gray Whale
Photograph courtesy NOAA
A barnacle-encrusted gray whale pokes its head above water in Scammon Lagoon off Baja California.
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Underwater View of a Young Blue Whale
Photograph by Flip Nicklin
Earth's largest animal, the endangered blue whale can eat some 4 to 8 tons (3.6 to 7.3 metric tons) of krill per day.
Animals
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Aardvark
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Adélie Penguin
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African Elephant
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African Lion
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African Wild Dog
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Albatross
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Alligator Snapping Turtle
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Amazon Horned Frog
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American Alligator
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American Bison
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American Bullfrog
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American Crocodile
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Ammonite
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Andean Condor
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Anglerfish
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Ankylosaurus Magniventris
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Ant
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Arabian (Dromedary) Camel
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Arctic Fox
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Arctic Hare
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Arctic Skua
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Armadillo
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Asian Elephant
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Asian Lion
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Atlantic Bluefin Tuna
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Atlantic Puffin
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Aye-Aye
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Baboon
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Bactrian Camel
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Bald Eagle
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Baltimore Oriole
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Beaver
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Beluga Whale
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Bengal Tiger
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Bird of Paradise
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Black Bear
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Black-Footed Ferret
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Black Mamba
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Black Rhinoceros
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Blacktip Shark
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Black Widow Spider
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Bluebird
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Blue Crab
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Blue-Footed Booby
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Blue Jay
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Blue Marlin
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Blue Whale
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Boa Constrictor
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Bobcat
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Bottlenose Dolphin
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Box Jellyfish
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Brachychampsa Montana
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Brown Bear
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Bull Shark
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Burmese Python
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Butterflyfish
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California Condor
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California Sea Lion
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Canada Goose
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Cane Toad
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Canvasback
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Caribou
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Carolina Wren
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Cheetah
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Chimpanzee
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Chipmunk
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Cicada
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Clouded Leopard
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Clown Anemonefish
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Coelacanth
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Common Earthworm
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Common Loon
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Common Octopus
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Common Sandpiper
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Common Vampire Bat
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Common Wombat
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Coral
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Cottontail Rabbit
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Coyote
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Cretoxyrhina Mantelli
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Cuban Screech Owl
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Cubera Snapper
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Deer Tick
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Devil Frog
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Dingo
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Dog Snapper
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Dolichorhynchops Osborni
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Domestic Cat
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Domestic Dog
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Draco Lizard
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Dugong
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Eastern Coral Snake
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Eastern Diamondback Rattlesnake
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Eastern Gray Kangaroo
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Egyptian Giant Solpugid (Camel Spider)
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Electric Eel
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Elephant Seal
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Elk
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Emperor Penguin
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Fennec Fox
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Firefly (Lightning Bug)
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Flying Fish
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Flying Snake
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Fossa
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Frilled Lizard
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Fur Seal
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Galápagos Tortoise
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Gelada
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Gentoo Penguin
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Geographic Cone Snail
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Giant Anteater
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Giant Clam
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Giant Pacific Octopus
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Giant Panda
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Giant River Otter
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Giant Squid
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Gibbon
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Gila Monster
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Giraffe
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Golden Cowrie
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Golden Eagle
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Golden Jellyfish
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Golden Lion Tamarin
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Golden Poison Dart Frog
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Gray Whale
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Great Blue Heron
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Great Egret
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Greater Flamingo
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Greater Rhea
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Great Horned Owl
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Great White Shark
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Green Anaconda
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Green Basilisk Lizard
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Green-Eyed Tree Frog
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Green Iguana
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Green Sea Turtle
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Grizzly Bear
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Groundhog
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Hammerhead Shark
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Harbor Porpoise
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Harp Seal
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Hawaiian Monk Seal
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Hawksbill Sea Turtle
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Hedgehog
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Henodus Chelyops
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Hesperornis Regalis
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Hippopotamus
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Honeybee
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Horned Toad (Short-Horned Lizard)
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Hornet
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Horse
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Howler Monkey
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Humpback Whale
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Impala
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Indian Rhinoceros
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Ivory-Billed Woodpecker
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Jackrabbit
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Jaguar
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Kemp's Ridley Sea Turtle
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Killer Whale (Orca)
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King Cobra
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King Vulture
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Kinkajou
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Koala
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Komodo Dragon
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Krill
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Ladybug
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Laughing Kookaburra
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Leafy and Weedy Sea Dragon
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Leatherback Sea Turtle
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Leopard
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Leopard Seal
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Leptoceratops Gracilis
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Lesothosaurus Diagnosticus
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Lionfish
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Little Red Flying-Fox
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Llama
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Lobster
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Locust
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Loggerhead Sea Turtle
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Lynx
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Macaw
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Madagascar Hissing Cockroach
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Mallard Duck
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Manatee
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Mandrill
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Marine Iguana
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Matschie's Tree Kangaroo
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Meerkat
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Meller's Chameleon
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Mexican Axolotl
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Mola (Sunfish)
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Mole Rat
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Monarch Butterfly
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Mongoose
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Mononykus Olecranus
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Moose
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Mosquito
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Mountain Goat
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Mountain Gorilla
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Mountain Lion
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Mouse Lemur
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Mudpuppy
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Musk-Ox
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Narwhal
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Nile Crocodile
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North American River Otter
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Northern Leopard Frog
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Nudibranch
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Nurse Shark
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Nutria
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Ocelot
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Olive Ridley Sea Turtle
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Opossum
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Orangutan
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Oriental Fire-Bellied Toad
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Osprey
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Ostrich
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Oyster
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Ozark Big-Eared Bat
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Pachycephalosaurus Wyomingensis
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Parrot
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Parrot Fish
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Peacock
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Pelican
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Peregrine Falcon
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Pileated Woodpecker
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Platecarpus
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Platypus
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Poison Dart Frog
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Polar Bear
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Porcupine
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Portuguese Man-of-War
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Prairie Dog
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Praying Mantis
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Proboscis Monkey
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Pronghorn
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Protosphyraena
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Protostega Gigas
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Przewalski's Horse
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Pufferfish
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Queen Angelfish
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Quetzal
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Raccoon
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Rainbow Trout
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Raven
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Red Crab
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Red-Eyed Tree Frog
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Red-Footed Booby
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Red Fox
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Red Kangaroo
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Red Leaf Monkey
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Red Panda
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Red-Tailed Hawk
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Red Uakari
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Rhesus Monkey
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Right Whale
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Ringed Seal
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Ring-Necked Pheasant
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Ring-Tailed Lemur
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Rockhopper Penguin
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Rocky Mountain Bighorn Sheep
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Ruby-Throated Hummingbird
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Sailfish
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Saltwater Crocodile
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Sandhill Crane
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Sand Tiger Shark
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Scarab
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Scorpion
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Sea Anemone
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Sea Cucumber
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Seahorse
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Sea Otter
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Siberian Tiger
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Sifaka
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Skunk
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Sloth Bear
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Snow Goose
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Snow Leopard
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Snowshoe Hare
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Snowy Owl
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Sockeye Salmon
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Spectacled Bear
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Sperm Whale
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Spider Monkey
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Spotted Hyena
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Spotted Salamander
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Spring Peeper
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Squirrel
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Starfish (Sea Star)
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Steller Sea Lion
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Steller's Sea Eagle
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Stick Insect
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Stingray
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Styxosaurus Snowii
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Sumatran Rhinoceros
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Sun Bear
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Tapir
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Tarantula
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Tasmanian Devil
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Thescelosaurus Neglectus
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Thick-Billed Murre
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Thomson's Gazelle
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Three-Toed Sloth
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Tiger Salamander
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Tiger Shark
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Toucan
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Triceratops Horridus
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Triggerfish
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Troodon Formosus
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Tundra Swan
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Tusotheuthis Longa
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Two-Toed Sloth
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Tylosaurus Proriger
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Tyrannosaurus Rex
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Velociraptor Mongoliensis
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Wallaby
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Wallace's Flying Frog
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Walrus
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Warthog
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Warty Newt
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Wasp
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Water Buffalo
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Web-Footed Gecko
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Weddell Seal
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Western Lowland Gorilla
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Whale Shark
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White-Eared Kob
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White Rhinoceros
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White-Tailed Deer
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Whooping Crane
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Wildebeest
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Wild Turkey
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Wolf
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Wolverine
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Wood Stork
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Xiphactinus Audax
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Zebra