Swallows migrate south to keep warm in the warmer climate. Swallows live on a diet of insects. They build their nests out of mud or nest in man-made structures.
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Swallows keep warm by fluffing up their feathers to trap air, which acts as insulation. They may also huddle together with other swallows for extra warmth. Additionally, they have a high metabolic rate to generate body heat.
With a heater maybe?
to stay warm. =D
inside fires
so they keep warm to do later on....if you no what mean
To keep their Yak body warm.