B
buffalo
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They cannot or do not?I am not sure about meteorologists or quantum mechanics, but most biologists accept that concept of species for sexually breeding species. There are different definitions for bacterial species, where a single individual splits into two.
There is no loss of function required. The smallest change between species I am aware of is three mutations. One mutation changed the colour and the other two mutations changed the breeding season. In neither case was function lost. Both species have colour and both species have a breeding season. The different colours mean that they live in different habitats (camouflage) and the different breeding seasons means that they do not interbreed.
The two species are Chrysopa carnea and Chrysopa downesi.
rossum