This might be a record for me: 16 mason bee cocoons in a single nesting tube. The ones on the left are larger and likely all females. The smaller ones on the right are males, who emerge first and then wait for females to come out. It's really cool how hymenopterans can control the sex of eggs they lay (males are from unfertilized eggs). Osmia georgica. #InsectHotel #BeeHotel #bees #cocoons #insects #pollinators #hymenoptera #osmia #haplodiploidy