Flippers And Fins

? While underwater, the Marine Iguana's main predators are sharks, who can "hear" their heartbeat from up to 13 feet away. However, these iguanas drop their heart rates to half of that on land to avoid being detected.

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Spotlight: Heidi Sosik - Ocean Twilight Zone Why are microscopic plankton so important for life in the ocean's Twilight Zone? Find out in this interview with WHOI biologist Heidi Sosik.

Taking the day off.