Lawnmowers Of The Ocean

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Sea turtles have been around for about 110 million years and live for about 100 years. Here are some interesting facts about these reptiles: * They can hold their breath under water for five hours. They do this by slowing their heart rate to where it beats about every nine minutes. * Sea turtles and manatees eat sea grass. This helps to keep the beds of grass healthy. The grass is important to numerous marine animals and provide breeding and developmental grounds. * There are seven species of sea turtles. These are: Kemp's ridley, olive ridley, leatherback, flatback, loggerhead, green, and hawksbill. * They a great sense of direction because they are able to detect the Earth's magnetic field. They use it like a compass. * Sea turtles are very vulnerable when hatching and nesting because they cannot retract their heads and flippers into their shells.