A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Alligators can live up to 100 years.
337
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
Dogs sometimes fake being sick to get attention.
26
It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
492
Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
12
Penguins have a gland above their eye that turns saltwater into freshwater.
12