Posts tagged “esophageal diverticulum

Redpoll: Adapted to Gorging

Common Redpoll - Fairbanks, Alaska

These redpolls, and many more, are coming to our feeder lately in droves.   I’ve started putting seed out one or two times a day instead of letting them gorge themselves at the feeder nonstop.  I don’t want to test it out but I would be willing to bet they could empty the  entire contents of the feeder in only one day. (It’s on the small side but can still fit at least a quart jar’s worth of sunflower hearts.)

It’s unbelievable how much they can eat.  My guess as to how many birds visit the feeder per day is perhaps 30 to 40, though it could be upwards of 100 or more stopping by once a day (or less often).

Actually, they aren’t eating most of the seed.  Apparently they store it in their “esophageal diverticulum” and regurgitate it later to eat in peace.

Redpoll - Fairbanks, Alaska

These two”on-alert” fine fellows might actually be females (lack of red on their chests).

Once late May and June arrive, the birds practically disappear, so even if they are acting like little piggies at the trough right now, we still enjoy them!