The Clickets were a spacefaring insectoid species. They interpreted gratitude as a form of hostility.
On stardate 57818.4, the USS Cerritos rendezvoused with the Clicket ship Tweerk to obtain a map of the Romulan Neutral Zone. The Clickets attacked Freeman after she thanked them for the map, and a further subsequent misunderstanding led to a brief exchange of phaser fire between the vessels. (LD: "Veritas")