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2016-11-19 Birding - migratory birds:

Did you not get this answer?( I meant to say that to fully answer this question would take many pages of explanation.)    "As I said, this is a long and complicated answer whlch I answer fully in my book

2016-11-18 Birding - migratory birds:

As I said, this is a long and complicated answer whlch I answer fully in my book. But briefly, all birds respond to daylength as their clue for migration. No, they don't all start migration at the same

2016-11-17 Birding - migratory birds:

Depends on what you mean. Migration itself is an instinctive process so it is in their genes. But if you are asking how they know when to migrate, it has to do with day length. When the days get shorted

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