Condoms were originally made of animal intestines or linen.
347
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Gorillas can catch human colds and other illnesses.
205
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255
A group of pugs is called a grumble.
10
Dogs have been man's pet for over 14,000 years.
224