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This bee was big, slow and lumbering. I didn't see it fly, instead it was crawling from flower to flower. Also sometimes it wasn't even bothering to go inside the flower, it was going to the base of the flower and then pushing the petals aside to get to the nectar!
My blog: http://wolvobirder.blogspot.com
Could this have been a queen bee? It didn't have any pollen sacks and it was quite large.
Lat/Lng: 52.5621349, -2.1692762
OS grid ref: SO886960