Dugongs help maintain (keep healthy) ocean ecosystems (underwater communities of plants and animals) by pruning seagrass beds, which helps the grass grow stronger!
Aquatic Animals - Facts for Kids

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Random Facts About Aquatic Animals For Kids
It takes about 2–3 months for a baby jellyfish (ephyra) to grow into a fully-formed adult medusa!
Nudibranchs can eat creatures many times their own size by slowly nibbling away at them!
Male Orcas are called “bulls,” females are called “cows,” and babies are called “calves”!
NASA has sent jellyfish to space to study how zero-gravity affects their development!