[PIF]

OK. But how did they get the animal? Did they catch it or was it washed up on a beach? How often did this occur? Was it a one time event or a regular occurrence?

[SunkenCiv]

No one knows (at this time); whatever they used may not have survived all this time. Seals could have been speared on the beach. Dolphins would require hook/line, nets, or boats and spears. Could also be the general friendliness of the dolphin was exploited, in which case any hand-held blade might have done the trick.