#mating-behavior

#mating-behavior

The spotted ratfish is a two-foot-long fish with a big head and a long, skinny tail that lives in the northeastern Pacific Ocean. It belongs to a group of fish called chimaeras that are closely related to sharks. (Chimaeras are sometimes called ghost sharks.) Like most vertebrate creatures, it has teeth in its mouth. Unlike other vertebrates it also has teeth in another location: its forehead. It uses these forehead teeth for sex.

Male and female lacewings of the same species sing each other essentially the same romantic song. It's encoded in their DNA. One lacewing species sounds a bit like a purring cat, another one more like a growling stomach.