22 Jun 2013
Rapid Evolution
How some American cliff swallows have evolved to avoid ending up as roadkill. Mary Bomberger Brown of The University of Nebraska has been studying groups of these swallows for the past 30 years.
How some American cliff swallows have evolved to avoid ending up as roadkill. Mary Bomberger Brown of The University of Nebraska has been studying groups of these swallows for the past 30 years.