CURWOOD: It’s Living on Earth, I’m Steve Curwood.

DOERING: And I’m Jenni Doering.

DOERING: They are tiny birds, but tough ones. And they are flying against the trend of wildlife moving toward the poles as the planet warms, as Mary McCann tells us in today’s BirdNote®.

Here Come the Merlins.

MCCANN: Want to see one of the blazing thunderbolts of the bird world? Smaller than a pigeon — but fierce enough to knock one from the air — are the powerful, compact falcons known as Merlins. While global climate change is pushing ranges of many birds farther north, Merlins are actually expanding southward.

Merlins nest in northern forests around the world. But in recent years, more and more Merlins have been nesting farther south, in towns and cities across the northern United States. These small falcons will take over old crow nests, especially in conifer trees — in parks, cemeteries, and neighborhoods.

No one knows precisely why, but part of the answer may lie in a rebound of Merlin populations since the banning of pesticides like DDT. And it’s a reminder that bird behavior may be more flexible than we sometimes imagine.

Merlins reach their peak southward migration in October. Although some, like those in the Pacific Northwest, remain year-round, most scatter to the south for winter. Some travel as far as Ecuador. With any luck, you might see these adaptable, pint-sized thunderbolts in your neighborhood.

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Written by Bob Sundstrom
Bird sounds provided by The Macaulay Library of Natural Sounds at the Cornell Lab of Ornithology, Ithaca, New York. Recorded by Bob McGuire and Geoffrey A Keller.
BirdNote’s theme music was composed and played by Nancy Rumbel and John Kessler.
Producer: John Kessler
Managing Producer: Jason Saul
Associate Producer: Ellen Blackstone
© 2017 Tune In to Nature.org October 2017 Narrator: Mary McCann

DOERING: For pictures, soar on over to the Living on Earth website, loe dot org.