In southern California, mountain lions are in decline in part because of the expansive freeways that crisscross the state. When researchers tagged a sample of lions in Santa Ana with GPS devices, they found their natural habitats divided by as many as eight lanes of traffic, as well as houses, golf courses, and other private developments.
Despite proposals to build animal crossings after the fact, over- and underpasses have proven ineffective; they’re rarely used by the big cats. The risks go farther than just ending up as roadkill. The roads themselves become cages for mountain lion populations, isolating various groups and resulting in higher rates of inbreeding. This threatens their growth and survival as a whole.
Full article at Map Lab:
Its a fascinating read...