Off the coast of Florida, dredging material has created a string of tiny islands.
On most of the islands, native green anole lizards have made their home. On some of these, invasive brown anoles have moved in as well. Together, the intermingled populations create a natural experiment.
Researchers including Paul Hohenlohe of the University of Idaho have discovered the green anoles sharing their islands with invaders evolve to be better suited to life higher in the islands’ trees – and fast.