For pollinating certain crops such as cranberries, bumblebees are far more efficient than honeybees
This is because a bumblebee tends to visit only a few plant species in a limited area, whereas a honeybee generally flies over a much broader area and visits a wider variety of species
The greater the likelihood of a given bee species visiting one or more plants in a given cranberry crop, the more efficient that bee species will be at pollinating that crop.