Male hippos can weigh up to 9,920 pounds while females weigh around 3,000 pounds, according to PBS." The animal's scientific ...

National Geographic is running a challenge for users to submit photos that "celebrate the beauty of the planet" for Earth Day ...

Friday, April 11 was National Pets Day, which gave the reigning AFC champions a great opportunity to highlight their players' furry (or, as it turned out, scaly) friends in a post to Twitter.

Pet-owners around the country are rejoicing today, as National Pet Day gives them yet another excuse to show off their ...

If you're curious about this awesome animal-centered holiday, then read on! We've got all the details on National Pet Day for ...

National Pet Day was founded in 2006 by Colleen Paige, an animal welfare advocate, and pet and family lifestyle expert. Send ...

Whether it's your dog's wagging tail, your cat's soft purring, or your bird's cheerful chirps, these little moments of love ...

Whether it is National Siblings Day or International Dog Day, the calendar is filled with offbeat, sentimental, and sometimes commercial "holidays." Some have a personal origin, while others were ...

National Geographic Explorer Paul Salopek has covered a lot of ground: some 14-thousand miles — on foot — through 21 ...

Known for spending much of its life underground, the little-known American burying beetle could hold the key to developing ...

Photographer Joel Sartore documents nearly 18,000 captive species for conservation through the Photo Ark project.

Colossal, the company looking to return the woolly mammoth to Earth, has created three dire wolves. See what they look like today.