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Given that kind of ecozone overlap, there are plants here that you’d normally expect to find in the Southwest — one species of prickly pear cactus is a native plant here, Labovitz says.

The new discovery is the latest development of a larger project which aims to find out more about mouse-eared bats living in the neotropical ecozone.

"Under natural conditions, it is very hard to see how the initial invasion of a new ecozone by hominids could have so consistently driven rapid change over the long period of time that we're talking about."

Viewed from space, this ecozone is truly the "blue planet," dotted with the emerald green of many thousands of islands, ranging in size from the smallest motu of an atoll in Tuvalu to the continental remnants of New Caledonia and the volcanic "high islands" of Hawaii and Tahiti.

That tree line is now a huge, broad, brush-filled ecozone, an example of what is happening in different places.