21+ Barn Swallows Migration 2017 Gif. Choose a temperature scenario below to see which threats will affect this species as warming increases. Large group seated barn swallow migration.
Migration is most evident among birds. 1 516 просмотров 1,5 тыс. Some are reaching northern states and southern provinces.
Migration is most evident among birds.
Migration is most evident among birds. Photograph of barn swallow (hirundo rustica) bringing food to the nest. The barn swallow (hirundo rustica) / lastavica подробнее. The barn swallows of north america journey over 12,000 miles in migrations as far south as argentina and back every year.