AbhiGarg2007 wrote:
Got it CJ !!!
So my explanation now asfollows:-
C. For songbirds, catching insects requires the expenditure of significantly more calories than eating wild berries does. (Correct)
As before migration to C&S America, birds need to accumulate enough calories, so as their time for migration approaches, they start eating exclusively berries to accumulate calories.
It means Berries have something special other than calories which help them to complete their migration.
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