Jul 23 2014
PABIRDS was a-buzz this month about a non-native species that’s rapidly expanding across North America. Though not yet established in Pennsylvania this bird has been seen in New York City. Will it get here soon?
Originally native to India, the Eurasian collared-dove (Streptopelia decaocto) is non-migratory but habitually disperses northwest when its population expands. It began its conquest of North America by human accident when a breeder released his flock of 50 birds in the mid 1970s after some escaped during a burglary in New Providence, Bahamas. As the population expanded in the Bahamas the doves looked northwest and found … Florida! 180 miles of ocean was not a barrier. Eurasian collared-doves were found nesting south of Miami in 1982.
By now the Eurasian collared-dove is resident from Florida to Seattle, from southwestern Canada to northeastern Mexico. The Northeast is the only chunk of the continent they haven’t conquered yet. Considering that they prefer urban and suburban settings with bird feeders and trees, it’s only a matter for time before they completely cover the U.S.
How do you recognize a Eurasian collared-dove? They’re similar to mourning doves, pictured below, but bulkier with a black collar, a squared-off tail and, unlike escaped turtledoves, gray undertail vent feathers. Here’s a photo of a Eurasian collared-dove in flight and here’s a mourning dove. Notice the difference in tail shape. The collared-dove’s three-coo song is different too.
Some worry that Eurasian collared-doves will displace mourning doves but it doesn’t seem to be the case — at least in Florida where Cornell Lab’s Project Feederwatch studied both species in 2011. Careful counts revealed that “Contrary to expectations researchers found that the abundance of native dove species was generally greater at sites with collared-doves than at sites without collared-doves.” Click here to read more.
What does the future hold for us? Eurasian collared-doves are resident to the south and west. They’re working their way up the coast and have made it to the Outer Banks, NC. This month Vern Gauthier saw a pair in Lancaster County, PA. They’ve been spotted in New York.
Are they coming to Pittsburgh soon? We should start watching!
(photos by Chuck Tague who lives in Florida where Eurasian collared-doves are well established)