Jan 7, 2014 | Featured Web Article

How do Birds Keep Warm in Cold Winter Weather?

Birds have a number of ways to beat the cold, but none so important as their feathers.
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Birds have a number of ways to beat the cold, but none so important as their feathers. You may have noticed how on a very cold day the birds at your feeder seem rounder and more puffed-up than usual. This is a way of keeping warm by raising the feathers to create pockets of warm air and enhance insulation. In addition, many species change their plumage, molting into a fresh thick set of feathers prior to the colder months.

Especially helpful are the very fluffy and soft body feathers known as down. These feathers provide super insulation, much like the goose down we use in coats and comforters.

At night, birds can dramatically slow down their body's metabolic rate (the rate at which the body consumes energy) and lower their body temperature to conserve energy. During very cold nights, small birds such as chickadees and nuthatches may find a tree cavity or birdhouse where they can spend the night, huddled together with several other birds of the same species. Such communal roosting permits the birds to share body heat. There have been reports of as many as 20 pygmy nuthatches sharing a single tree cavity. Ducks can swim in water that is almost frozen because their feathers have natural oils and are waterproof. Waterproof feathers retain all of their insulating ability. Ducks have a netlike system of blood vessels in their legs that brings warm blood from the heart alongside cold blood returning from the feet, keeping the feet warm in icy water.

What do birds do when it's windy?

When it comes to wind, birds have many coping behaviors. They face the wind so moving air does not ruffle their feathers, thereby robbing them of the insulating heat layer between feathers and skin. They stay low to the ground, where the wind speed is lower, and in the lee of any objects that can deflect the wind: tree trunks, power poles, fenceposts, shrubs, grass clumps, buildings. Birds also move as little as possible, thus conserving energy. Because they keep to dense cover, birding in high winds may be a bird-free proposition.

Anything I can do to help?

We all know by now that birds can survive without our help in the winter. Some ornithologists have even suggested that bird feeding is more beneficial to us (humans) than it is to the birds. Be that as it may, studies have shown that birds with access to bird feeders in winter survive at a higher rate than birds without access to feeders. The difference between the haves and the have-nots is not huge, but it's there. Feeding birds in winter, if done right, is a good thing for the birds (and for us, too).

Here are 10 ways you can help feeder birds in bad weather »



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  • I understand that the ducks' blood vessel arrangement in their feet is to provide the benefits of the counter-current heat exchanger mechanism; returning cold venous blood from the feet is warmed by the descending warm arterial blood, preventing excess heat loss by the feet and avoiding cold blood from chilling the body. This means that the feet are cold, not warm.
    by Frank Barch, Sat, 02 Jan 2021
  • I have the same situation. The feeder is attached to the middle of a large picture window that goes ceiling to floor w/ no ledge or sill for animals to climb or balance. Yet every morning all the sunflower seeds have been cracked open and hulls left. Any ideas what it is?
    by Liza Fox, Sun, 15 Nov 2020
  • I have a bird feeder that sticks to my window and I've been hearing noises against the window at night right now its going on. But whatever it is it is aware of me. And when I get to window it leaves.I can't imagine a squirrel or mouse or possom being able to get at it. ...So as I was reading this article im to assume no bird eats at night. Or no birds will eat at night. Why is that? Then im also thinking of a sinereo that could a lost confused bird eat at night. This eating thing is watching meI turn out the light go there noise dissappears..Thank you.
    by Nosferatu, Thu, 05 Nov 2020
  • I have metal baffles (cones) on my pole for my bird feeders. Something is still tempting them at night. What else could it be? Deer???
    by Ella Spencer Connolly, Thu, 27 Aug 2020
  • I found where he lives, then I keep him up all day by singing at full volume! Hah, that'll show the little sucker!
    by Pike Juan, Tue, 11 Aug 2020