Whales and dolphins can't taste anything other than salt.
11
Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
16
The cat brain weighs about 30g.
167
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
The reindeer is the only mammal that can see UV light.
17
A lion in the wild usually makes no more than twenty kills a year.
186
Domestic pigs average a top speed of about 11 miles per hour.
182