Question

Hormonal change of bird before migration

Answer 1

Here's the answer:

Physiology

Even birds get hormonal! Before migration, birds undergo hormonal changes that literally change their physiology. Changes in hormone levels cause them to fatten up and build energy reserves to sustain flight. Then, just prior to departure, the digestive system shrinks because the birds may not eat again for several days.

Conversely, the flight muscles and heart increase in size and capacity. The birds also molt into their stunning breeding plumage. The bright, beautiful colors help them attract a mate and the fresh new feathers are strong for sustained flight.

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