New answers tagged ornithology
This example proves IMHO that migration is largely nature and not nurture: In the Netherlands, white storks were bred / reintroduced. A large part (about one third?) of the reintroduced birds do not migrate, but their offspring usually does migrate see. They couldn't have learned it from their parents, that's for sure.
It seems as though it is named for feathers below the beak that have a barblike appearance, rather than actual barbs. It may be clearer from these images: India Nature Watch Or in this photo: SivamDesign - Flickr
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