“A bird’s body heat warms the air between its feathers,” Marra explains. “So birds fluff up in the cold to trap as much air in their feathers as possible. The more trapped air, the warmer the bird.” One way birds keep their legs and feet warm is to stand on one leg, while the other is tucked up warmly in its feathers.Click to see full answer. Thereof, how do birds not freeze to death in the winter?Winter Birds Myth: Birds will freeze to death when temperatures drop far below zero. They store fat during the short days of winter to keep themselves warm during the long nights. During those freezing nights, they fluff their feathers to trap heat and slow their metabolism to conserve energy.Also, what temperature is too cold for birds? That said, it is extremely important to make sure that your pet bird is well-protected from any major drop in temperature. Simply put, it can be dangerous to expose a bird to an environment that is kept at any less than 65 degrees Fahrenheit. In respect to this, how do Cardinals survive winter? Cardinals, impossible to miss against the snow, and other smaller birds puff up into the shape of a little round beach ball to minimize heat loss. Birds can also put on fat as both an insulator and energy source: More than 10 percent of winter body weight may be fat in certain species, including chickadees and finches.Where do birds sleep at night in the winter?Winter is a challenging time for backyard birds such as cardinals, woodpeckers, nuthatches, chickadees, titmice and wrens. But roosting in tree cavities, bird boxes and an assortment of makeshift shelters can help these birds stay warmer at night and give them an energetic edge.