Princeton University Oct 24 2025 Evolutionary biologists have long believed that the human-biting mosquito,  Culex pipiens  form  molestus ,evolved from the bird-biting form,  Culex pipiens  form  pipiens , in subways and cellars in northern Europe over the past 200 years. It's been held up as an example of a species' ability to rapidly adapt to new environments and urbanization. Now, a new study led by Princeton University researchers disproves that theory, tracing the origins of the  molestus