The Basenji dog is the only dog that is not able to bark.
4
The reindeer is the only mammal that can see UV light.
17
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Worker bees must visit around 4,000 flowers in order to make one tablespoon of honey.
5
Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17