I learned about some naughty beetle larvae in a great book called Keeping the Bees by Laurence Packer. The terribly ingenious larvae of the Francisco oil beetle (Meloe franciscanus) will clump together (about 700 in a ball) and emit a pheromone that makes the male habropoda pallida bee think he's found a willing floozy. When the bee approaches, the entire clump of larvae leaps onto him, and is eventually taken back to the nest. Check out movie #1 to see this in action! What's amazing is how the clump remains intact as it leaps from stem to bee. Bloody fantastic! You must go watch the video. The little buggers knock the poor bee to the ground!
"This movie shows a male Habropoda pallida bee approach and contact an aggregation of Meloe franciscanus triungulins on the tip of a wooden rod. The bee then falls briefly to the ground, covered with the entire mass, and finally flies off with most of the triungulins attached to his body. There is a second larval mass 11 cm below the mass on the tip of the rod. "