Birds, whose very survival depends largely on their ability to move rapidly away from danger by flying, have a huge problem in nest design. Namely that nests are stationary and are subject to predation if the nest is found.
Thus it is very interesting to observe birds during the nesting season to observe how they change their behaviors. For example, the male will sing loudly and for prolonged periods while he is recruiting a mate, defending his territory, and the female is making the nest.
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