Invasive species are a nice model.

I learned what invasive species I have. Even in my own backyard.

Once an invasive species arrives, it's about impossible to get rid of it.

Pigs are probably one of the most damaging invasive species.

It's likely that such lags reflect, at least in part, adaptive changes in the invader to suit it to the new environment.

We find that toads with longer legs can not only move faster and are the first to arrive in new areas, but also that those at the front have longer legs than toads in older populations.