Over the years, Kimberly Witham brought home the bodies of birds, foxes, squirrels, groundhogs, possums, voles, and raccoons, before finally laying them to rest in a patch of Earth close to her New Jersey home. Once, she found a fisher cat, a member of the weasel family. “I find baby deer every spring,” she says. “They are bigger than you think and so sad to find.” All of these individuals have died on the road–a few of the estimated one billion wild animals killed by vehicles annually across the United States.