So for example...

We work on this species, for instance, that is called tungara frog.

[frog croaking] And males produce a call that sounds like their name, tungara.

[frog croaking] And if you have a male that is calling by himself, he will mostly produce the first part, tung.

[frog croaking]

They're preyed upon by parasitic flies, except for a select few crickets that had a single mutation that made it impossible for them to make that iconic chirping sound.

So this is a very strong selective pressure, and the crickets in Hawaii became silent.

[pensive music] So we know that evolution usually is a slow process, takes a lot of time, but we also are learning evolution sometimes can happen really fast.