Scientists estimate only about 3,000 wild tigers are left in the entire world. Meet the subspecies and see what threats each is facing.
Check out some of nature's irresistibly cute baby animals.
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Blacktip Reef Shark
Photograph and caption submitted to My Shot by Manny Ramirez
The blacktip reef shark, Carcharhinus melanopterus
Photograph and caption submitted to My Shot by Mike Guzman
This photo was taken at Shark Reef Aquarium at the Mandalay Bay in Las Vegas, Nevada. The dark tank ensured that the sharks would be active. It also made it difficult for me to get a properly exposed shot. I used the on camera flash and took the shot at an angle to avoid glare. This was the first time I had ever seen these sharks in person. They are amazing. Hammerheads are my favorite sharks, and I was extremely happy to have been able to walk away with this shot.
Photograph and caption submitted to My Shot by Blair Nixon
This is a gray nurse shark photo taken during a dive in Jervis Bay, Australia.
Juvenile Lemon Shark
Photograph and caption submitted to My Shot by Matthew Potenski
Juvenile lemon sharks
Sharks in Tahiti
Photograph and caption submitted to My Shot by Rick Zurbriggen
Photograph and caption submitted to My Shot by Pam Wood
I was out on a dive trip in Grand Bahamas going to a popular dive destination called "Tiger Beach." This location is known for seeing lemon and tiger sharks. I was not disappointed and was face to face with this big lemon shark, who was kind enough to pose for me. This photo clearly shows how the teeth are easily replaced by the ones directly behind.
Lemon Shark, Bora Bora
Photograph and caption submitted to My Shot by Dougie Souness
This was a close encounter with a lemon shark taken in Bora Bora at 20 meters down at the dive site Tapu.
Shark With Fish
Photograph and caption submitted to My Shot by Caroline Brewer
This is a picture of a shark and a school of fish following behind. This shark was photographed at the Atlantis Resort at one of their aquariums. I photographed it in black and white because I thought the photo would speak louder and clearer without bold colors distracting the viewer.
Shark in Cuba
Photograph and caption submitted to My Shot by Eladio Fernandez
This shot was taken in Jardines de la Reina in Cuba.
Photograph and caption submitted to My Shot by Carlos Suarez
No caption provided
White Tip Shark
Photograph and caption submitted to My Shot by Mohamad Izwas Ibrahim
Barracuda Point, Sipadan, Malaysia. This is one of the best dive sites in Sipadan. I waited about 40 minutes at a depth of 14 meters to see a school of barracuda. The current was quite strong, and I just stayed behind the boulder. While looking at the wall of barracudas, a couple of white tip sharks swam around the wall. Suddenly, the sharks came close to me, and I took the opportunity to take this shot.
Sharks have prowled Earth's seas, essentially unchanged, for 400 million years. Learn more about these vital predators with facts, photos, video, and more.
South African marine researchers lured a half-ton great white shark closer than anticipated—straight out of the water and into their vessel.
Explore the underwater world of this bottom-dwelling shark. Learn why humans have little to fear, and much to learn, from nurse sharks.
Find out why this shark is not nearly as fierce as its protruding teeth might suggest. See how surface air breathing sets them apart from their relatives.
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A longtime shark researcher and advocate, Dr. Gruber runs the Bimini Shark Lab in the Bahamas.