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 thinknkg about types o of habitat and types off species that are thriving g her. man: hey, i thought i told you guys to get out of here. now, go. come on. get out of here. male reporter: we have a mom and her kids all going for a nice, refreshing swim all at the exact same time. woman: there is a hidden jungle in cities like los angeles, and a hidden savannah and hidden wetlands, and other kinds of ecosystemsms. pauly: there's no magic line where nature stops and city begins. it's all a giant matrix. and in the most urbanized parts of los angeles, you can still find literally thousands