Many birds live in pairs during the breeding season, and in winter form flocks. Explain the reasons for the temporary association of birds in flocks.

1) Many forms of behavior in birds are caused by instincts – complexes of unconditioned reflexes preserved by natural selection.
2) In the spring, the instinct of reproduction begins to appear in birds, so they form (break up) pairs.
3) It is easier for birds living in a pack to navigate in space, defend themselves from enemies and get their own food

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