Tuesday, December 3, 2013
Blood is diverted into a heat exchanger in birds’ legs by sphincter muscles to conserve heat. Arterial blood arriving from the heat exchanger in the leg is as warm as the body core temperature and the venous blood from the feet is nearly as cold as the surrounding air. Similar to a radiator, the heat flows from the arteries into the veins along the length of the heat exchange, ensuring that the venous blood will be warmed before returning to the rest of the body.
So it’s good to have a heated birdbath in the winter. As long as birds are able to find food which they turn into "heat" energy, and keep their feathers clean, they can survive in extremely cold conditions.
- Are there heated birdbaths that are solar? http://bit.ly/tnTrK4
- Last Minute Gifts for Birdwatchers http://bit.ly/tXwHJ8
- How to Prepare Your Yard for Winter Birdwatching http://bit.ly/uduvLm
- Attracting Bluebirds in the Winter http://bit.ly/sw0H6P
- Most common winter birds in Michigan http://bit.ly/vSkLTn