Non-honey bees

Leafcutter and mason bees can be bred in artificial trap-nests, for example for experimental purposes or for pollination of crops. When the density is high, and nest entrances to each other, females can get lost or engage in quarrels with their neighbours. Leafcutters can lose the leaf pieces they carry, and when a piece falls to the ground, it is not picked up but the poor bee must fly to cut another one.

Here is a citation of the paper which inspired this cartoon – one of research tasks was to weigh the dropped leaves

Guédot, C., Bosch, J., James, R. R., & Kemp, W. P. (2006). Effects of three-dimensional and color patterns on nest location and progeny mortality in alfalfa leafcutting bee (Hymenoptera: Megachilidae). Journal of economic entomology, 99(3), 626-633.