They are primarily used to search for escapees who are still lurking within the jungles of Zartacla. When the target is found, the occucrows would either fly around and caw above the target, or attack them directly (if the target is small-sized). Despite their abilities, occucrows can be fooled by disguises.
They made their first appearance in "Escape!", where they attempt to capture Aerrow and Radarr. They ended up circling around a Radarr mannequin, while another occucrow was shot off when Radarr flinged a tree branch against it.