Orangutans in rehabilitation centers (places that help animals recover) have been observed washing their hands after seeing their human caregivers do it!
Mammals - Facts for Kids

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Random Facts About Mammals For Kids
The Suffolk is the biggest sheep breed — some rams can weigh up to 400 pounds (181 kg)!
A meerkat’s territory must include areas with loose soil for digging and foraging!
Dhole pups vocalize with high-pitched squeaks and yips before they learn the characteristic whistle of adults.
Basic Information
Beavers belong to the family Castoridae (a group of animals that are related) and are the second-largest rodents (gnawing animals) in the world, after capybaras!