Every spring that I can remember, I’ve stopped in my tracks at some point by the annual appearance of ground bees in Rancho Sierra Vista/Satwiwa.
Hundreds and hundreds of bees, burrowing about in holes in the ground, these are male ground bees - looking for females to mate with and foraging for nectar. But the good news is that these male bees have no stingers. The females can sting, but will not generally do so unless provoked.
Most importantly, these bees are pollinators, which is a good thing. So just…let them BEE if you come across them.
I’ve personally seen these ground bees on the Lower Satwiwa Loop Trail, near the junction of the Satwiwa Loop Trail, on the north Satwiwa Loop Trail (the one that connects to the Satwiwa Native American Center) and on the Wendy-Satwiwa Connector Trail. See map at THIS LINK.