Scientists are investigating why large animals like the mule deer of Wyoming go where they go—and how humans can get out of their way.
In general, it’s surprising how little ecologists know about why large animals choose their migration paths. The motivations for moving are obvious, and include things like food, water, and a safe place to raise young. But how herds or animals learn their routes is a major debate. Evolution plays some role.
The results of the mule deer study indicate that once animals have learned an ideal path, it can be hard for them to shake. And therefore, any sort of obstruction presents a problem, as researchers have found in prior studies. “The animals that migrate the longest distances and are the best surfers consistently have the highest body fat,” Aikens says. “Those are the ones that are most likely to survive the harsh winter.
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