Fetcherflies are insects found on the island of Vvardenfell and in the Tenmar Forest of Elsweyr. Lone fetcherflies are harmless. However, when something approaches their nests, they will swarm and attack whatever they perceive as a threat. They emit a moderate amount of heat, singeing fur or hair on contact, and due to this heat, their nests often glow and have pores emitting smoke. Occasionally, their nests become Hive Golems, which can move around independently. These golems are attracted to the destruction of regular hives, and will seek out those responsible. 
Fetcherflies are used by some Ashlander anglers as a lure. Fetcherfly husks stuffed with sea sponge make passable pin cushions, and a puree of crushed fetcherflies can be used as an unorthodox ingredient in lotion.