A papillomavirus-like infection in canaries (Serinus canarius) is desc
ribed. Papillomatous epithelial proliferations were observed at the co
mmissure of the beak and on the head. Histologically, stratified squam
ous epithelium covered with a hyperkeratotic layer and intranuclear in
clusions were observed. Electron microscopically, intranuclear aggrega
tes of papilloma-like virus particles were demonstrated.