|One of our backyard Blue Jays on the coconut feeder outside our kitchen window. He's not greedy. He's filling the gular pouch in his throat with sunflower seeds to hide in one of his many winter food caches.|
How can one bird eat that many seeds?
It can't! When you see Blue Jays downing one seed after another, watch closely, and you'll see they aren't eating the seeds at all, they are storing them in a pouch in their throats called a gular pouch. Blue Jays have a built-in carrying case called a gular pouch under their tongues. This expandable pouch extends down into their throats as far as the upper esophagus. In late summer and all through the fall Blue Jays and other birds, such as chickadees, nuthatches, and Tufted Titmice, start hoarding acorns and other seeds and nuts in winter caches. By storing their food, they can survive long, cold winters when their normal food sources freeze over or run out.
Click here for an older post with photos of a Blue Jay filling his gular pouch with peanuts, and learn how Blue Jays with their acorn caching ways repopulated areas with oak trees after the last glaciers retreated.
Click here for an earlier post on scatter-hoarding and winter food-caching birds in our area.
|Gobble, gobble...it's fun to watch Blue Jays gobbling up sunflower seeds. They waste no time filling their gular pouches, then fly off to a winter cache, deposit them, and come back for more.|
Blue Jays behaving badly (or is it just fall migration?)...
While most of the red, yellow and gold leaves of autumn have fallen from the trees and faded away, it's still fall, and Blue Jays are still out there doing their autumn antics. My mom called a few weeks ago reporting 17 Blue Jays were in her backyard behaving badly. They were impersonating hawks, stealing seed, frightening the titmice, and taking over every feeder in their yard...but, she loved it! It's very exciting to have a marauding band of migrating Blue Jays in your yard, especially when you live in the city! She wanted to know what was going on, so I let her know in autumn, some northern Blue Jays take to the wing and migrate south, while others stay put. When they migrate, they form large groups of what really do look like marauding bands, and when a flock lands in your backyard, watch out. They will raid all of your feeders and plunder till nothing remains. Then they will be gone in a flash, not to return.
Click here for a pdf of a paper by Paul A. Stewart in North American Bird Bander, July-Sep. 1982, titled, "Migration of Blue Jays in Eastern North America," pgs 107 - 112. Stewart analyzes banding and recovery records to identify the birds' migratory movements, showing Blue Jays are partly migratory because some groups stay throughout the year, and of those that do migrate, not all return to their same nesting grounds. Stewart includes maps that show the locations of direct recoveries of banded migratory birds.
|This fellow is not part of a marauding band. He's just a regular at the Coconut Cafe outside our kitchen window.|
|...put the blue in the coconut and shake it all up.|
|Gobble up those sunflower seeds Ol' Blue and secret them off to your winter food cache. Your scatter-hoarding will get you through the winter, plus it's great for seed dispersal!|