Australian treecreepers are primarily insectivores, insect eaters, with ants composing the biggest portion of their diet. They forage, search for food, for ants and other insects along the trunks and branches of trees they have climbed, especially trees that have rough bark. Treecreepers are known to peel bark, or dig into fissures, cracks, in order to find their prey. Their long claws make it possible for them to hang onto a trunk or branch in an upside down position, but they seldom move downward on a tree. The other insects they eat include beetles, larvae, and spiders. Rarely, a treecreeper might take nectar or seeds in addition to insects.

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