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Prehistoric-looking Marine Iguana have evolved a very specialized aquatic lifestyle: diving to graze on algae. Photo by participant Judith Harackiewicz.
Guide Willy Perez (r.) kept a sharp eye out for wildlife while we relaxed on the comfortable upper deck of our chartered catamaran. Photo by participant John Keith.
Lava Gull has the smallest range, and consequentially the smallest population, of any gull species. Photo by participant John Keith.