Two-thirds of Europe’s birds have moved to cooler areas over the last 30 years, mainly to the north and east by 100 kilometers on average. They are trying to find the conditions they are best suited to under global warming. But these journeys come up against obstacles such as mountain ranges and oceans. This has been observed by scientists in a study recently published in the journal PNAS.
Click here for original story, Study shows obstacles slow down birds as they shift ranges in response to global warming
Source: Phys.org