Nature's Notebook 10-25-07


So, what do you think of the autumn show? Last weekend, while we were still enjoying unseasonably warm days, the fall foliage was coming into its own. Although many of the lower-elevation trees such as the red maples had passed their prime, the hillsides were bathed in golds, yellows, browns and greens, presenting many beautiful tableaus.

Here’s another color to think about this time of year: blue — and specifically the vibrant azure of one of our most familiar songbirds, the

align=justifyhere’s another color to think about this time of year: blue — and specifically the vibrant azure of one of our most familiar songbirds, the>

blue jay. Did you know that the blues of a blue jay — in fact, virtually all blues in nature — are not blue? By that I mean they’re not produced by pigment, like other colors, but instead they are reflected light from microscopic structures in the feathers.

 

At this time of year, we probably see more blue jays than at any other. That’s because there are at least three "groups" of blue jays present: permanent residents that nest here and stay through the winter; migrants that are passing through; and arrivals from farther north that will also stay the winter.

Strangely for such a common and familiar species, surprisingly little is known about the blue jay’s migratory behavior. Why for instance, do some migrate and others not, when all jays are theoretically able to survive our winter? Which ones go and which ones stay? How far to they migrate, and where do they go? The answers to these questions await further research.

Another important behavior of blue jays at this time of year is the harvesting and storage of acorns and other nuts for the winter, much the way squirrels do. A single jay may bury several thousand acorns in a single cache, placing them in the topsoil and burying them under a loose layer of dirt, rocks and leaf litter. Blue jays apparently remember the location of buried nuts and return to the cache throughout the winter.


Fred Baumgarten is a naturalist and writer. He may be reached at fredb58@sbcglobal.net. His blog is thatbirdblog.blogspot.com. 


 

 

 

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