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Automatic TRANSCRIPT

This appears at the bodies of birds in North America are getting smaller KCBS reporter Melissa call Russ has more on the research which suggests that shrinking birds are the result of climate change a study that began simply with one experts carry off ET about birds that were crashing into windows in Chicago shows that birds bodies are shrinking the reductions in body size over the last forty years that we find are associated with increasing temperature is in areas where these birds are breeding in the summertime so in boreal North America university of Michigan biologist Brian weeks is lead author of the study and he says researchers were surprised to see that wild birds bodies are smaller their wings fans have been increasing why might that be we accept the theory related to birds behavior of birds get smaller it's harder and harder for them to maintain their migration but they have to migrate and so in response we see this natural selection where they get an increase in wing length that make them more efficient fired this study suggests that between nineteen seventy eight and two thousand sixteen north American birds lost two point six percent of their body mass on average and weak says scientists don't understand what the limits are of these adaptive changes Melissa call Ross