Three hundred and five bodies and 32 skeletons were identified by aerial and satellite photography between the Gulf of Penas and Puerto Natales, near the southern tip of South America. They may have been sei whales.[34] This is one of only two or three such baleen mass stranding events in the last hundred years. It is highly unusual for baleens to strand other than singly, and the Patagonia baleen strandings are tentatively attributed to an unusual cause such as ingestion of poisonous algae.