Thanks to a nice heads up from Radiolab I spent a little chunk of my morning checking out this University of Maryland study on underground highway culverts as safe passage for animals. It's not only fascinating that the animals are daring enough to use these tunnels but that such a wide variety of species travel through them. "The study found 57 species in all used 265 culverts to cross the road or build a nest in Maryland, confirming that these drainage structures are carrying more than just streams."

The only bummer is that the photo gallery of images is stuck inside their Facebook page - though you get the best of the best from this Tumblr post.