Bicolored pollen pellets on a bumble bee
Yesterday, I saw this bumble bee foraging on a self-heal flower, Prunella vulgaris. The thing that stands out is the bicolored pollen pellets, orange fading into white.
Although you can see bicolored pollen pellets frequently on bumble bees, you almost never see them on honey bees. Honey bees have very strong floral fidelity, which means once they begin collecting pollen, they stick with that same flower type for the entire foraging trip. Other bee species have less floral fidelity and will often switch flower types to fill out their load.
Floral fidelity is one of the characteristics that makes the honey bee such great a pollinator. Once a honey bee is in a field or orchard, she keeps pollinating that particular crop, whereas other bee species sometimes switch to different flowers. They may, for example, start out pollinating a crop like apples and then get distracted by something growing in a hedgerow or roadside, like a dandelion.
This bumble changed her mind at some point in her foraging trip, but she sure makes a pretty picture, all orange and glowy.