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Which tree squirrel species forages only on the ground?

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Do squirrels forget where they hide their food? — squirrel Overview of food-burying behaviour in squirrels.

Within the family Sciuridae, the African palm squirrels (genus Epixerus) are identified as tree squirrels that are long-legged runners and forage only on the ground.1

While most tree squirrels are arboreal, the range of their activity varies significantly. Some species, such as the African palm squirrels, have adapted to a strictly terrestrial foraging behavior despite being classified among the tree squirrels.1