The plumage characteristics of male Indigo and Lazuli Buntings are distinct, but the two species can learn each other's songs. Populations comprising Indigo, Lazuli and hybrid individuals occur in the ...

When two organisms typically do not interbreed with one another, they are considered different species. But what are the reproductive barriers that isolate one population from another? Hear the ...

Speciation is a central and fundamental process in evolution that concerns the origin of reproductive isolation. The latest generation of genomic approaches provide remarkable opportunities to ...

Peripheral portions of the ranges of the leopard frogs R. chiricahuensis, R. pipiens, R. blairi, and the lowland form (an unnamed species of the leopard frog complex) intersect in the extreme ...