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Have a look at how the pollen is being transported and you will see that it is using the hind legs. O. rufa (a member of the leaf-cutter bee family - Megachilidae) always transports pollen on the underside of its abdomen
Thanks, Stuart! First of all, I thought it was a pale Andrena fulva and then I thought the colour made it more likely to be Osmia rufa. However, I stupidly forgot to look how it was transporting the pollen and I appreciate you pointing that out!
Age does weary them too!!
There must be quite a lot of old bees in the garden then! I'm spending so much time observing solitary bees and bumblebees on my mum's bramble, raspberry and tayberry bushes that I'm quite frequently late for meals!