Condoms were originally made of animal intestines or linen.
347
The octopus does not have a blind spot.
273
Early American humans hunted car-size armadillos and used their shells for houses.
12
The reindeer is the only mammal that can see UV light.
17
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6