SteveSS
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Although we have very few bugs in general at our elevation we do have an outbreak of Miller Moths every summer. The swallows have adapted a way of catching them. There are several articles like this.
Dear Johnnie: While waiting for the light to turn green at major intersections in Longmont and elsewhere, we notice a lot of wacky birds circling aimlessly and repeatedly dive-bombing cars. It’s really bad at Colo. 66 and Main Street and Ken Pratt and Main. Any idea what’s going on in their teeny little heads? — Tom
Dear Tom: I don’t know what’s going on in their tiny little heads, but I do know what’s going through their teeny little beaks, and that their dive-bombing is not aimless.
Those are swallows — likely barn swallows — and they are chasing miller moths, according to Jennifer Churchill, public information officer for the Division of Wildlife’s Northeast Region.
But why at intersections?
Churchill explained that at night, the moths tend to hang around the lights at those intersections, then stay around during the day. That attracts the swallows.
I found several other explanations online and cannot verify them. Those include theories that moths hide in the crevices of cars, and then fly once the cars stop at traffic lights.
I've heard the moths get under the hoods of cars. When the cars are idling at intersections they get too warm and escape. The birds have figured this out and hunt the intersections. I have never seen one of these birds land. They're in constant aerobatics.
Dear Johnnie: While waiting for the light to turn green at major intersections in Longmont and elsewhere, we notice a lot of wacky birds circling aimlessly and repeatedly dive-bombing cars. It’s really bad at Colo. 66 and Main Street and Ken Pratt and Main. Any idea what’s going on in their teeny little heads? — Tom
Dear Tom: I don’t know what’s going on in their tiny little heads, but I do know what’s going through their teeny little beaks, and that their dive-bombing is not aimless.
Those are swallows — likely barn swallows — and they are chasing miller moths, according to Jennifer Churchill, public information officer for the Division of Wildlife’s Northeast Region.
But why at intersections?
Churchill explained that at night, the moths tend to hang around the lights at those intersections, then stay around during the day. That attracts the swallows.
I found several other explanations online and cannot verify them. Those include theories that moths hide in the crevices of cars, and then fly once the cars stop at traffic lights.
I've heard the moths get under the hoods of cars. When the cars are idling at intersections they get too warm and escape. The birds have figured this out and hunt the intersections. I have never seen one of these birds land. They're in constant aerobatics.