"The male Northern Cardinal is perhaps responsible for getting more people to open up a field guide than any other bird. They’re a perfect combination of familiarity, conspicuousness, and style: a shade of red you can’t take your eyes off. Even the brown females sport a sharp crest and warm red accents. Cardinals don’t migrate and they don’t molt into a dull plumage, so they’re still breathtaking in winter’s snowy backyards. In summer, their sweet whistles are one of the first sounds of the morning." (Quote from Cornell Lab of Ornithology All About Birds.)
During winter Cardinals tend to aggregate in loose flocks. Seeing several males sitting together provides a welcome contrast to an otherwise drab winter scene. In late spring and summer, cardinals form pair bonds and a male will vigorously defend his territory against incursion by any other male. It is not unusual to see a male fighting with his own reflection in a car's outside mirrors.
Cardinals seem determined to stretch their day out for as long as possible. The Cornell site notes "... their sweet whistles are one of the first sounds of the morning." During the summer, I often work out in our garden until very late in the afternoon. Many times I'm finishing a project or gathering up my tools as the sun sets. As I wrap up my gardening chores, there's often a male Cardinal perched in a nearby tree singing.
Please see the Cornell Labs site for species details about range, behavior, nesting, etc.
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