What does it say on the info card?
I am voting for it having been an attraction at a travelling circus, contracted / developed / died of anthrax and was buried on the island so as to be well away from being a danger.
My speculation is based on the fact that there is an elephant buried in soft ground near here (Castle Douglas) that was an attraction at a travelling circus, the animal then contracted / developed / died of anthrax and was safely buried. One to confuse future archaeologists
![Smile :)](./images/smilies/icon_smile.gif)
Beware of yawning dogs.