Sentence Examples with the word in migration

This difficulty in migration is probably the reason why the existing European flora is so poor in large-fruited trees compared with what it was in Miocene times or with the existing flora of North America.

Many ducks breed here, and many others pass through in migration :: of the former, the most numerous are mallard and teal; of the latter, pintail, shoveler, scaup, ring-neck ducks, and mergansers.