Marmots usually mate right after they wake up from winter sleep (emerge from hibernation) in early spring.
Mammals - Facts for Kids

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Random Facts About Mammals For Kids
The word “tapir” comes from the Tupi language of Brazil, where native people called them “tapyra”!
Lemur mothers carry their babies for about 2–5 months before giving birth!
Elephants create trails through forests that can last for hundreds of years!
Each giraffe has a unique pattern of spots, just like human fingerprints — no two giraffes look exactly alike!