When two nudibranchs meet and are ready to mate, they sometimes do a little courtship dance — waving, touching with their tentacles, and circling around each other before mating!
Aquatic Animals - Facts for Kids

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Random Facts About Aquatic Animals For Kids
Orcas can hold their breath for up to 15 minutes while diving deep underwater!
The deepest living starfish have been found at depths of 20,000 feet (6,000 meters) — that’s deeper than 65 football fields stacked on top of each other!
Basic Information
Pufferfish belong to the family Tetraodontidae, which comes from Greek words meaning “four-toothed” because of their four large teeth!
Some starfish can move really fast — sunflower sea stars crawl about 3 feet (1 meter) per minute, and sand stars can zoom over 9 feet (3 meters) per minute!