In Does the mosquito’s hum alternate between D and F?, Doug says that different species of mosquitos that live in the same area would have different pitches to avoid inter-species mating. Obviously mosquitos wouldn’t want to waste time on mating if the offspring would be a dud (either wouldn’t be concieved, viable or fertile).
However, what is so bad about hybridization? Doesn’t it still mean that the individual’s genes get passed on? Is this one of those descent of species vs. descent of individual things?