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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...
This bait ball shows how small fish can react when larger predators are near, gathering tightly together in a ball-like formation that exposes the least number of fish.
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Bait Ball

 This bait ball shows how small fish can react when larger predators are near by...
The mandarinfish lives in western Pacific tropical coral reef ecosystems and lacks the scales that are typically seen on bony fish.
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Mandarinfish Duo

 These beautiful mandarinfish (Synchiropus splendidus) are covered in bright blue,...