I was struck by the behaviour of Bumblebees around a neighbours plum tree this weekend, and its carried on this evening.
There have been literally dozens of them, at least three species, seemingly feeding on the surface of the leaves. I can only presume that there is some sugary solution being produced by the tree - similar to that which Sycamore produces that attracts so many aphids - but I cant actually see, feel or smell anything. Still, the bees obviously can because I've just looked again now and they're all over the tree. I cant find anything with a quick websearch so I guess its answers on a postcard!
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