Gator Nation

S1, E1: Along the 15-mile Tamiami Trail in Florida, bikers find themselves just a few feet away from hundreds of American alligators. For two months of out of the year, the town of Kaktovik, Alaska, is home to the country’s largest concentration of native polar bears. Gila monsters hide out underground in Arizona’s Sonoran Desert, but come spring, residents get a rare glimpse of these venomous lizards.