The Basenji dog is the only dog that is not able to bark.
4
15% of snails survive digestion by birds and are found alive in their droppings, potentially leading to the spread of snail populations.
1
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Gorillas can catch human colds and other illnesses.
205
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
A scorpion can hold its breath for up to 6 days.
19