"How
do birds stay warm in the winter?" One of our patrons stocks several birdfeeders year-round. With the cold weather we've been having lately, she was
worried about how her birds were keeping warm. Putting "how do birds stay
warm" into an online search engine showed that this is a popular concern.
Some
birds will fly south for the winter, especially the species that eat insects
rather than seeds. However, the ones that stick around in snowy climes have
their own ways to stay cozy. Birds' natural oils help waterproof their
feathers, and some birds will grow extra feathers for the winter. Like people,
they can shiver to stay warm, and they're also known to sit in the sun when
they can, sometimes spreading their wings to get as much sun as possible. When
sunshine isn't an option, they fluff up their feathers to trap pockets of air,
which then serve as excellent insulation. On especially cold nights, some will
enter a torpor, dramatically lowering their body temperature and heartbeat so
as to conserve warmth. They may also huddle together and share heat that way.
To
keep their legs warm, birds can either stand on one leg, tucking the other up
under their feathers, or hunker down to keep both legs cozy. According to an article at birding.about.com, the special scales on birds' legs also can help
retain heat.
Bird
lovers have several ways to help their feathered friends make it through the
winter. Providing good winter food such as suet and black oil sunflower seeds
will give birds the calories they need to stay warm. Keeping a heated birdbath
will give them a reliable source of drinking water. Finally, having a clean
birdhouse, roost box, or just a yard full of evergreen trees and shrubs can
give birds a snug place to roost. Sally Roth's "Attracting Birds to Your Backyard" suggests putting your old Christmas tree outside where it can
serve as a shelter.
For
information on building birdhouses and birdfeeders, patrons can check out some
of the books we have here at the library, including Paul Meisel's
"Bird-Friendly Nest Boxes & Feeders" and Don McNeil's "The Birdhouse Book." For information on attracting and feeding birds, we have
"North American Birdfeeder Guide" by Robert Burton and Stephen W.
Kress, and "Attracting Birds to Your Backyard" by Sally Roth.