A large amount of plastic was found in the whale's stomach, although it is unclear if the waste caused the whale's death, according to the organization.
Six sperm whales have washed up on Italian beaches in the last five months, according to Greenpeace. The most recent whale was found in Palermo on Tuesday, Felice Moramarco, press officer for Greenpeace Italy, told ABC News. An necropsy will be performed on Wednesday, Moramarco said.
Last month, a pregnant sperm whale was found dead outside Porto Cervo in Sardinia with about 50 pounds of plastic in its stomach, National Geographic reported.
In March, after a dead whale washed onto a beach in the Philippines, 88 pounds of plastic were found in its belly, according to Greenpeace.