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This is Scientific American's 60-second science.

I'm Lucy Wong.

You might expect to hear parrots like these in the wild of South America,

but the birds are actually nesting in the middle of Chicago.

Despite being known as monk parakeets, the green and gray squawkers are true parrots,

and they've been living in the windy city since the 1970s, but not just there.

There are monk parakeets in many, many states.

They're breeding in around 21 states.

Jenny Euling, a PhD student now at Cornell, who was at the University of Chicago when she studied

these birds. Certain populations will pop up in certain states and then, you know, disappear, but they're

by far the most widespread of any of the species. Yuling wanted to know how many non-native parrots

were living in the U.S. To do this, we used Ebert and Christmas bird count, or CBC,

and we used these two databases

because they have the largest spatial distribution of data,

basically, for the United States.

Euling and our team looked at data collected from 2002 to 2016

...