A four-part series on “The Reptiles” begins with “Alligators and Crocodiles.” Included: their sensory systems and intelligence; courtship and mating signals; importance to ecosystems; their evolving relationship with humans; and their roles in the food chain that vary with their locations, including Australia; India; Florida; and Venezuela. Howard McGillin narrates.
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Ready to Watch Nature, Season 21, Episode 7?