Raccoons will use any kind but deer avoid culverts with cobbled floors and eastern gray squirrels don’t seem to like arch-shaped passages, the study’s lead author, ecologist J. Edward Gates, said Friday. Great blue herons prefer box-shaped culverts with sandy bottoms, the study found....

Culverts are tunnels, usually made of concrete or metal, that allow water to flow beneath roadways. Animals moving along stream banks may naturally follow the water through culverts, Gates said.

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