Bridges and Tunnels in Colorado Are Helping Animals Commute

The aim was to protect motorists and wildlife along an especially grisly stretch of highway. Now, it was time to see whether the investment would pay off.Aran Johnson, a wildlife biologist for the Southern Ute Indian Tribe in the southwestern part of the state, walked up a bank to a newly constructed overpass crossing Route 160.He’d been trying not to worry about the project. After all, the existing research was…