useless trivia: What Word Means: Gets Rid Of?

Questions

Insects and Spiders are the most abundant animal class. Which class holds the number two spot?

At a weight of 220kg(485lb) and a height of 200cm(6'7"), what is the world's heaviest primate?

Any and every spermologist knows that the cheetah is the world's fastest mammal, but only the best can name number two?

The Top 10, Heaviest Mammals on the face of the Earth, go?

With a weight averaging 7,800kg (17 lbs), this critter boasts having the heaviest brain?