Sloths take two weeks to digest their food.
243
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
A domestic cat can sprint at about 31 miles per hour.
274