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Which habitat contains most tree squirrel species?

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

Most tree squirrel species are found in tropical rainforests. While tree squirrels inhabit a variety of environments ranging from boreal forests to woodland savannas, the majority of the 122 known species—specifically those within 20 of the 22 recognized genera—are native to these tropical regions.1