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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...
An adult coho salmon swimming.
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Coho Salmon

Although they spend most of their life in the ocean, when it's time to reproduce...
a diagram comparing the size of a water droplet to the size of a bacteria to the size of a virus
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The Size of a Virus

Bacteriophages are viruses that infect bacteria. Here, a water droplet is used...