On a recent below zero morning, a blue jay perched with feathers fluffed against the cold. By erecting its plumage the jay creates more dead air space, thus increasing the insulating value of its feathers.
Photo of the week
A blue jay with feathers fluffed against the cold.
December 21, 2009 at 2:23PM
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billmarchel
It’s too soon to tell how much the immigration crackdown is to blame.
