Throw Back Thursday (TBT):

Winter is more than halfway over.  We turned the corner on Groundhog Day.

As spring sunlight increases, birds’ hormones trigger courtship and territorial behavior.

Northern cardinals feed peacefully together during the winter but soon the males won’t tolerate each other.  Click here to read about their spring behavior in this blog post from 2008:  Cardinals See Red.

(photo by Marcy Cunkelman)