narrator: on this episode of "earth focus"...los angeles is knonown for i its urban sprawl d traffic-clclogged sysystem of freeways rather thanan its diverse array of living species. the second-most-populated city in america is actually a biododiverse hotspot--one e of just a few in the entire world. wiwithin the confifines of t ths coconcrete junglele, species are adapting and, in some cases, even thriving. welcome to the los angeles urban wild. woman: southern california is one of many hotspot areas around the globe which are areas s of extraordinary biological diversity. man: if we just think about l.a. county, you're going from sea level to 10,064 feet when you get up to mt. san aonio. whenen you think about that eletitional rangege, which i is the grereatst elevational rarange of any couny in the united d states, there''a divverse suite of habitatats in ththere, and that inclludes habitat that might be right along the busiest freeway in the country...but it also includes places where mountain lions live. i mean, it's just this place of absolutely incredible diversity when it comes to thin