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In high summer males can be very common. They sit around on flowers drinking nectar. They prefer flowers with big sturdy heads such as thistles and natweeds and gangs of males can often be seen clustered together, reminiscent of a group of men propping up the bar in a pub.
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Dave Goulson (A Sting in the Tale: My Adventures with Bumblebees by Dave Goulson (28-Apr-2015) Paperback)