A fanquirl is a small parasite bird that latches itself onto creatures that travel the desert of Heimr. They have huge tails that function like fans to keep their host cool, all the while sucking energy trough their skin.
Beasts often crush these parasites by bashing their skin against a rock or tree. However, now that evolution made sure the birds help the host by cooling them down the wise creatures gladly give up a bit of energy to keep themselves cooler during their travel trough the desert.
The fanquirl has a wingspan of only 4 centimetres.