The Basenji dog is the only dog that is not able to bark.
4
A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
293
A scorpion can hold its breath for up to 6 days.
19
Domestic pigs average a top speed of about 11 miles per hour.
182
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
Lobsters have blue blood.
476
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23