How does the aye aye primate find food?

Percussive foraging.

The aye-aye is the world's largest nocturnal primate.

By tapping on branches and tree trunks with its skeletal middle finger, the aye-aye is able to detect wood-boring grubs. Using that same digit, it can then catch the grubs.

Aye-ayes also have sensitive ears like bats. These help it hear the hollow areas of trees that contain grubs, in response to the tapping.

https://www.worldwildlife.org/magazine/articles/meet-the-aye-aye-the-world-s-weirdest-primate