On a prickly pear (Opuntia sp) flower
Carlsbad, CA
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P7190513b
Some nest entrances with full 90-degree turn turrets. Some plugged with pine resin which may indicate Osmia nemoris is using abandoned nests of D. diminuta. Penny for scale
Feeding on Shortpod Mustard, with a nest site around the plant, https://www.inaturalist.org/observations/54670374.
Pollinating a Texas prickly pear cactus