All nudibranchs are hermaphrodites, meaning each one has both male and female reproductive organs!
Aquatic Animals - Facts for Kids

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Random Facts About Aquatic Animals For Kids
Blue whales can swim the length of three football fields in under a minute!
The Atolla jellyfish, which lives in deep ocean waters, is usually about 4–6 inches (10-15 cm) in diameter but can flash bright red light that can be seen from 100 feet (30 meters) away!
Physical Characteristics
Dugongs have a special split upper lip that helps them grab and sort through seagrass, working like built-in garden tools!
Some dolphins travel up to 100 miles per day looking for food!