A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
A cow produces around 200,000 glasses of milk in her lifetime.
373
Lobsters have blue blood.
476
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 have been man's pet for over 14,000 years.
224