The Basenji dog is the only dog that is not able to bark.
4
Unsinkable Sam (nickname of a German ship's cat) who served on 3 warships, one German, two British, all sank in action. The cat survived each sinking, floating away on wooden planks to rescue.
19
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
Tigers can see 6 times better at night than humans.
305
Domestic pigs average a top speed of about 11 miles per hour.
182
Gorillas can catch human colds and other illnesses.
205