can species be told from this ?
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... anecdotally, definitely leafcutter bee, but I don't know if there is more than one species of leafcutter.
I kept finding them, last year, in flower pots: they dig a tunnel through the soil, drag down several of these beautifully neat circles of foliage, roll them around into a short pack, lay an egg in it and seal it up. They repeat this until the tunnel is full, I've seen five or six in a row.
The clever bit is that the last one laid hatches out first, leaving the tunnel clear for the next one, and so on!
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Lat/Lng: 55.9669, -2.4063
OS grid ref: NT747749