I photographed many bees, one I didn't write about was the Cuckoo Bee (Nomada ruficornis species group) pictured here on the left. These small rusty brown colored bees are thieves of sorts, otherwise known as kleptoparasites.
They lack any kind of pollen transport structure so they rely upon other bee species to do their pollen collecting for them.
The Mining Bees collect and stock their ground nest with pollen which they lay their eggs upon so the hatching larva can consume the pollen.
|Andrena bee in foreground, Nomada bee behind|
"A Nomada female will slip into a host's nest and stick her eggs into the wall of the host's larval cell before the host has finished stocking it with pollen. When the host (usually an Andrena bee) finishes stocking her cell and lays her egg in the nest, the Nomada larva will kill the host's egg and take over the nest, like a cuckoo chick in a bird's nest." (Insects Their Natural History and Diversity)
It indicates that we are providing the right types of flowering native plants and nesting sites so that Andrena and other solitary native bees can successfully build nests and rear young (except for the ones taken over by the Cuckoo Bees of course).