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Last fall I spent time in SE Missouri and saw chipmunks climbing to the very top of huge oaks to harvest acorns. I always thought of them as true ground squirrels. This happened at dawn, after owls are to bed and before hawks are up. As a biologist, I wonder if this is unusual or not and if it's something that the young do or all ages.

Wildlife Expert - Ken Burton

Chipmunks are considered "semiarboreal" or sometimes "semiterrestrial." While they're usually seen on the ground, they do climb well opportunistically to reach desired food sources - such as acorns. Very few rodents are strictly terrestrial or arboreal. Tree squirrels, as you know, are often seen on the ground, and ground squirrels sometimes climb. Chipmunks are intermediate.

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