Each autumn as many birds begin epic journeys to warmer climates, there are always some species that stay put for the winter. These winter birds have a better chance of maintaining their territory year-round, and they avoid the hazards of migration. But in exchange they have to endure the cold.
Like us, birds are warm blooded, which means their bodies maintain a constant temperature, often around 106 degrees Fahrenheit. To make enough heat, and maintain it, they\’ve evolved many different strategies–some similar to our own.