All pollinators, both insects and vertebrates, visit flowers to get something out of them for themselves. This may be nectar, pollen or both. During this visit pollen lands on the body, after which it may accidentally land on the stigma of either the same flower or another flower. This is also true for the bumble bee. Bumble bees, as well as other bee-like insects, have special structures on their bodies in which they store the pollen they have collected. Bumble bees have baskets on the hind legs, to which they regularly transfer the pollen that has landed on their bodies. The pollen in these baskets is not available for pollination any more. For pollination purposes only the loose pollen on their bodies matters.