The Basenji dog is the only dog that is not able to bark.
4
Vanilla flavoring is sometimes made with an ingredient from beaver pee.
82
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Female kangaroos have three vaginas.
2
In 2011, a male tiger in India adopted a litter of orphaned cubs, taking on the role of ‘mother’. Wildlife officials say such behavior had never been observed before.
9
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Alligators can live up to 100 years.
337