In an unprecedented effort, 15 aquariums from around the world are teaming up to raise endangered baby zebra sharks and reintroduce them into the wild, where populations have nearly gone extinct.

Opalescent baby squid have "midwives" to bring them into the world. Squid eggs wait in gelatinous orbs to hatch. Capitella worms will make their way to the eggs and wrestle inside. The red worms make ...