Anyway, I'm not sure what type of bees these second bees are...if you know, feel free to comment!
landscapes as pollinators of three-quarters of flowering plants and
as soil-builders. For people, this means every third bite of food along
with fibers, nutrients and beverages is the result of pollination.
Plants rely on pollinators to reproduce and set seed. Honey bees
pollinate crops, but native bees also have a role in agriculture and
they are essential for pollination in natural landscapes. There are
1,300 native species of ground-nesting, twig-nesting and parasitic
bees found within Arizona. This guide gives information for
identifying 10 major groups of bees commonly observed in Arizona
including key characters, sizes (in mm), nesting habits, floral
preferences, and distinctive behaviors."