“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.

　　Hares might be able to adapt over time. Some snowshoe hares in Washington State don’t turn white at all. Mills is trying to figure out whether hares and other wildlife can adapt as fast as the climate is changing.

　　“But how fast is too fast?” he asks.

　　24.Alex Kumar and his classmates catch snowshoe hares in order to find out

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