Bee larvae drum with their butts, which may confuse predatory wasps
The grub-like larvae use calluses to tap their cocoons in a curious chorus inside a plant stem
![female mason bee on hole in plant stem](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2021/03/030921_jb_bee-larvae_feat.jpg?fit=1030%2C580&ssl=1)
A female mason bee (Hoplitis tridentata) enters her nest through the broken top of a dead mullein plant stem. These nests can sometimes contain over 30 larvae arranged in brood cells.
Albert Krebs