That is because they are prolific hunters of rodents.

spiders actually catch and eat more harmful insects. 

Bats and dragon flies are two more animals whose diets consist of mosquitoes.

cormorants have been used by fisherman to catch fish

feasts on the decaying flesh of animals that have already been killed or died naturally.

Monkeys in Thailand and Malaysia are used to help farmers collect coconuts.

this serpent is a natural predator of poisonous snakes.

Earthworms

help aerate the soil and their waste is beneficial as a fertilizer.

Luwak coffee is considered a delicacy.   The beans for this coffee are fermented in the digestive system of the civet cat.  The beans are collected from the cat’s waste and sold for high prices.