Malignant Melanoma in a Humbolut Penguin(Spheniscus humboldti)

Abstract

In March 1997, about 20 years old male Humbolt penguin died at Niigata city aquarium. At necropsy, the penguin has 1.5 cm diameter black mass on surface of upper bill. Black mass was observed at all organs. This was diagnosed as a melignant melanoma by light microscopy.