They catch other hares with wire traps about the size of a breadbox, with some apples as bait(诱饵). Most of the hares they track live less than a year—a hazard(风险) of being what Kumar calls “the cheeseburger of the ecosystem.”

　　But snowshoe hares have a special skill：camouflage. They're brown during the summer, but turn white for the snowy winter months.

　　“There're times when you're tracking them and you know they're really, really close, and you just can't find them，” he says.

　　Hares switch color in the spring and fall in response to light, when the days get longer or shorter. But if the snow comes late, you get a white hare on brown ground.

　　“And they really think that they're camouflaged，” Kumar says. “They act like we can't see them.”

　　Kumar calls this “mismatching”， and it's becoming more of a concern with climate change.

　　“If the hares are consistently molting(脱毛) at the same time, year after year, and the snowfall comes later and melts earlier, there's going to be more and more times when hares are mismatched，” he says.

　　Scott Mills of North Carolina State University leads the research. He says they're finding that mismatched hares die at higher rates. That's a concern for the threatened Canada lynx, which mainly eats these hares.

　　“It's a very clear connection to a single climate change stressor，”Mills says.

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