Gull Pellet?

Gull Pellet?

Observation - Gull Pellet? - UK and Ireland. Description: This pellet was about 10cm long mainly made up of broken shells. Did not seem to have much vegetable matter and was quite loose in structure. Any ideas - we wondered if it was a gull pellet but thought it too big. There are otters in the area.

This pellet was about 10cm long mainly made up of broken shells. Did not seem to have much vegetable matter and was quite loose in structure. Any ideas - we wondered if it was a gull pellet but thought it too big.
There are otters in the area.