Sympatric Speciation Scenarios

Mosquitoes inhabiting the London Underground are genetically distinct from and rarely interbreed with above-ground mosquito populations.

Eastern gray squirrels inhabiting different geographic regions exhibit distinct coat colors.

The Kaibab and Abert squirrel species, which inhabit opposite sides of the Grand Canyon, evolved from a single ancestral species.

Resident and transient orca populations inhabit the same region of the Pacific Ocean but do not interbreed.

Hummingbirds living in close proximity to a food source are larger than those living farther away.