An Orca’s brain weighs around 15 pounds (7 kg) — about four times heavier than a human brain!
Aquatic Animals - Facts for Kids

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Random Facts About Aquatic Animals For Kids
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Sperm whales have a special scientific name: Physeter macrocephalus, which means “big-headed blower” in ancient Greek!
Some Orcas create nets of bubbles to trap fish before eating them!
The black and white coloring of Orcas is called countershading and helps them sneak up on prey!
Blue whales prefer deep ocean waters but sometimes come closer to shore to feed!