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#1
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#2
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Photoperiod which is length of day is their cue. BWT are actually neotropical migrants
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#3
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medulla oblongata
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#4
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the amount of daylight in the day
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#5
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same with gadwall I think,but I am not a biologist,just an MRI technologist
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#6
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Duh....you guys are so ignorant! They migrate in September because that is when teal season occurs! Some people lose sight of the obvious.
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