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A bamboo shark grows in a thick egg case. Even within the egg case, the embryonic sharks can sense predators nearby and, in response, stop all gill movement and hold still to slip under the radar.
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Shark Embryo

Sharks have young in three different ways. After internal fertilization, some...
Olive ridley turtles (Lepidochelys olivacea) are the smallest marine turtle, living in warm waters close to shore as adults. Female olive ridleys take part in mass nestings that can involve 150,000 individual turtles crawling up a beach at night to find a
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Olive Ridley Turtle

Olive ridley turtles (Lepidochelys olivacea) are the smallest marine turtle, living...