Now there is science behind why bruins so often end up on the same trails as people.
Spiny softshell turtles are strange-looking, snappy and reclusive. They are also, it seems, becoming more rare. Scientists have set out to discover why.
Dozens of prehistoric-looking fish once thrived in the rivers of eastern Wyoming. Work continues to bring several back, though biologists caution some may never return.
Seven native mussels in state act as natural water filters.
Black-footed ferrets were thought to be extinct before they were discovered near Meeteetse in 1981. Local biologists, conservationists continue stressing disease and habitat as tools to fight extinction.