Dactylopsila is insectivorous, using its strong incisors as chisels to pry insects such as beetle larvae from their hollows in trees, or extracting them with their long fourth finger. The latter is also used in a tapping movement to detect hollows of larvae under the bark or in dead wood. Petaurinae are om-
nivorous, but with a heavy emphasis on sap feeding, nectar, and blossoms. All species of Petaurus are able to bite wounds into tree trunks to start sap flow, whereas Gymnobelideus is reportedly unable to actively prepare feeding sites. This is discussed as a reason for Gymnobelideus defending a territory and for Petaurus only defending feeding trees. Apart from sap feeding, nectar and pollen are important parts of Petaurus diet, while several species are known to be pollinators.
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