Yellow Fever Mosquitoes
The yellow fever mosquito (Aedes aegypti) originated in Africa, where it evolved from an ancestor that still exists there today. Its ancestor prefers to lay eggs in natural tree holes and to feed on non-human animals. At some point, the yellow fever mosquito became domesticated, breeding in artificial containers close to humans and preferring human hosts. This domestication allowed their introduction into the New World via European ships leaving West Africa with slaves and containers of drinking water also holding immature yellow fever mosquitoes.