Table 1 Categories and their respective description used for rating the likelihood of grey seal predation and fox interaction.

From: Assessing harbour porpoise carcasses potentially subjected to grey seal predation

Category

Definition

Definite

The attack was observed and the carcass was retrieved straight after or the origin of trauma could be verified using genetic methods

Likely

It is highly likely that the documented trauma is the result of grey seal predation; the majority of parameters have been found

Possible

It is possible that the documented trauma is the result of grey seal predation; some of the parameters have been found; potentially some indication of a different origin of trauma

Escape

Scar tissue is present, indicating previous interactions with a grey seal, but the cause of death is not directly related

Unlikely

It is unlikely that the documented trauma is the result of grey seal predation; the majority of parameters have not been found; clear indication of a different origin of trauma

Fox

It is unlikely that the documented trauma is the result of grey seal predation, but indicators of an interaction with a red fox have been found