I spotted a white-tailed bumble bee on the earth in a flower bed which seemed to be unable or unwilling to fly. She started to climb a tulip, but the surface of the leaves was very slippery and she kept falling back so I picked her up on a stick and put it down near some flowers where she began eagerly nectaring. I fear that she may have had some damage which prevented her flying as I never saw her take off. To take the photos I was using high speed off camera flash, a technique which is new to me and was recently described by an expert at a Cambridge Camera Club meeting. I also used it to take some flower pictures which I will post soon.