The Basenji dog is the only dog that is not able to bark.
4
Cats sleep for 70% of their lives.
8
The Lion's Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago).
12
The reindeer is the only mammal that can see UV light.
17
There's a phone app called RoboRoach that allows you to remotely control a cockroach through a chip that you to manually implant into the unwitting critter.
10
The station master and operating officer at the Kishi Station, Japan, is a cat!
18
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6