Lisa Argilla, a vet at Wellington Zoo, said they suspected it had suffered multiple organ failure.

BBC: Lost Antarctic penguin dies in New Zealand zoo

Lisa Argilla, the veterinary science manager at the zoo, said Friday that they suspect the penguin suffered multiple organ failure.

NPR: Penguin Found Stranded On New Zealand Beach Dies

Lisa Argilla, a vet at Wellington Zoo, said the penguin had possibly struggled to find enough food or had had problems hunting and had come ashore as he needed to go through his seasonal moulting.

BBC: Lost Antarctic Royal penguin found in New Zealand