The Irukandji jellyfish is one of the most venomous creatures on Earth, but it’s so small (about the size of a grape) that it’s almost invisible in water!
Aquatic Animals - Facts for Kids

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Random Facts About Aquatic Animals For Kids
A blue whale’s stomach can hold up to 2,200 pounds (1,000 kilograms) of krill at once!
Orcas can be found in every ocean on Earth, from the freezing Arctic and Antarctic to warm tropical waters!
Orcas need to eat about 3-4% of their body weight each day — for a large male, that’s about 700 pounds (318 kilograms) of food!
Great White Sharks have around 300 teeth arranged in multiple rows, and they can replace lost teeth every few weeks!