Question

why do some birds living in extremely cold show migration?​

Answer 1

Answer:

Birds migrate to move from areas of low or decreasing resources to areas of high or increasing resources.

Or you can say that Birds migrate during winters due to extreme cold conditions to places where there is moderate climate....

For your brief answer :

Birds that nest in the Northern Hemisphere tend to migrate northward in the spring to take advantage of burgeoning insect populations, budding plants and an abundance of nesting locations. As winter approaches and the availability of insects and other food drops, the birds move south again. Escaping the cold is a motivating factor but many species, including hummingbirds, can withstand freezing temperatures as long as an adequate supply of food is available......

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Answer 2

Answer:

this is correct answer bro