The whale is thought to be a relatively rare juvenile minke whale, about four-years-old. It is thought the 35ft mammal was killed after eating a plastic bag and sustained propeller wounds when it hit a ship after it had died. A Coastguard spokesman said: "It probably died of contamination after eating a plastic bag or something similar. "Minke whales are plankton feeders and if they see floating debris they automatically think it's a jellyfish.