PhysOrg Posted June 24, 2020 Share Posted June 24, 2020 Barn swallows live almost everywhere on the planet, recognizable by their forked tail and agility in the air. Yet while they share these characteristics, these little birds often look slightly different in each place they live—with some so distinct they're splitting off to become new species.View the full article Quote Link to comment Share on other sites More sharing options...
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