A healthy puppy usually doubles their birth weight in the first week of life!
Mammals - Facts for Kids

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Random Facts About Mammals For Kids
When a cow chews its cud, each mouthful gets chewed about 50 times!
The longest cat jump ever recorded was 7 feet (2.13 meters) — that’s taller than most adults!
African wild dogs use different sounds to communicate different messages — they have specific calls for excitement, danger, and gathering the pack!
Armadillos like living where it rains about 12–15 inches each year — or where the ground stays damp near streams — so they can dig cozy homes and find food!