Scientists have rediscovered a fly living in the mouth of land crabs. One of the more bizarre choices of breeding substrates comes from Drosophila endobranchia. This species is one out of three known fruit flies that have found a home on (and inside) land-crabs. Although frequently mentioned in biology textbooks, the crab flies have somewhat surprisingly been neglected in active research since their description. The fly has actually not even been seen since its initial discovery in 1966.