No interactions present.
There look like several species in amongst this little lot. Any further information at all (eg nearby tree species, flowerbeds etc)?
Once found hundreds of dead bumble bees under a Lime,but don't know what caused it.
Reminded me of an older one:
Where you'll find a similar situation and discussion thereof.
Lat/Lng: 51.5033, -0.2595
OS grid ref: TQ208796
A group of dead bees - why would they have died and remained in a group?