Tootfinder

Barfing is their love language.♥️ A kinky male fruit fly barfs up a bit of his last meal and offers it as a nuptial meal to his intended. Discerning lady fruit flies swoon, and lap it up. #science #entomology

A single protein makes lovesick flies spill their guts
Producing a male-specific protein in digestion-related neurons may have led to the evolution of an odd “romantic” barfing behavior in one species of fruit flies.