Bee feeding on thistle for ID please

Bee feeding on thistle for ID please

Observation - Bee feeding on thistle for ID please. Description: Feeding on thistles in garden this AM. Medium sized bees collecting large amounts of pollen on their legs - so I'm guessing must have long hairs on the tibiae? Any ideas?

Feeding on thistles in garden this AM. Medium sized bees collecting large amounts of pollen on their legs - so I'm guessing must have long hairs on the tibiae? Any ideas?