There are more than a thousand dedicated wildlife crossings in the United States today, up from just a few in the 1970s and 80s, according to Patricia Cramer, an ecologist who has studied and worked in the field for two decades. But only 10 or 20 are overpasses.
https://www.nytimes.com/interactive/2021/05/31/climate/wildlife-crossings-animals.html
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