B. ternarius eat and collect both nectar and pollen. Nectar is sweet fluid produced by flowers that attracts bees, insects and birds. The nectar is stored in a pouch-like structure called the crop, then is regurgitated back at the nest where enzymes are added and remains exposed to air that allows the water from the nectar to evaporate which results in honey. B. ternarius collect pollen by the little hairs on their body then is moved to their hind legs called pollen baskets. It is then brought back to the nest and a little is mixed with the nectar which creates a protein-rich food to feed the larvae.