Dead bumblebees

Dead bumblebees

Observation - Dead bumblebees . Description: A dog walker found 25 dead bumblebees in the grass meadow at work today. In an area roughly 10 m2. Most had lost the lower part of the abdomen, some still had it intact, but you can see a hole. I think this is caused by a Conopid fly (Sicus ferrugineus),

A dog walker found 25 dead bumblebees in the grass meadow at work today. In an area roughly 10 m2. Most had lost the lower part of the abdomen, some still had it intact, but you can see a hole. I think this is caused by a Conopid fly (Sicus ferrugineus), but I'm not sure if it's usual to find so many dead bees in such a small area?