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Its life history is much simpler than that of the truly colonial bumblebees and can serve as an example of the life cycle of many other species.
After all, social life in the group of the bees is by no means general, although it certainly is a striking feature.
On the basis of its life history, we like to think that Andrena is more primitive than the bumblebees.
The way in which it transports its pollen is not so perfect, either.
It lacks pollen baskets and possesses only a large number of long, branched hairs on its legs, on which the pollen grains will collect.
Still Andrena will do a reasonably good job, so that an animal with a full pollen load looks like a gay little piece of yellow down floating in the wind.
Closely related to the andrenas are the nomias or alkali bees.
