Nick heads to cowboy country - southeast Arizona - in search of the horned lizard, a reptile with an amazing trick up its spiny sleeve. Armed with a high-speed camera, Nick finds a whole range of animals with spectacular defence mechanisms, but his target weird creature promises to deliver a literally eye-popping spectacle.

Nick travels the same Mendoza desert roads as Charles Darwin two centuries before, trying all his trapping tricks to find a 'Pink Fairy Armadillo'.