InterestingCows can easily walk up stairs, but find it incredibly difficult and generally avoid walking down them due to their anatomy and poor depth perception.581k
InterestingA blue whale's aorta (the main blood vessel) is large enough for a human to crawl through.561k
InterestingThe Chow Chow and Chinese Shar-Pei are the only two dog breeds that require a solid blue-black tongue as part of their official breed standard.49899
InterestingKoalas are not bears—they're marsupials more closely related to wombats and kangaroos.48737
WeirdThere’s a rare breed of chicken called Ayam Cemani that’s completely black. They have black plumage, legs, nails, beak, and even black meat, bones, and a black tongue!122k
InterestingThe difference between antlers and horns is that antlers are shed each year and are made of bone while horns are kept for life and are made of living tissue and bone with a sheath that is very similar to human finger nails.101k
Mind-BlowingA koi fish named Hanako lived to be 226 years old, making her the oldest koi ever documented. Her age was scientifically verified in 1966 by examining growth rings on her scales, and she died in Japan on July 7, 1977.83k