Interesting bees - my sources suggest this is an alfalfa leafcutting bee (
Megachile rotundata) originally from Europe but introduced to our side of the pond and has made itself at home. I have seen these in the Pacific NW but always thought they were a type of wasp.
Nice cacti flowers BTW

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Thanks Alan for the identification of the type of bees in these images. As you might have guessed I had no clue!
And thanks also for the comments on the flowers, appreciated!