 Hooded plovers and terns that nest along Cloudy Bay’s beaches are particularly vulnerable to predation by cats.Approximately 80% of the feral cats on Bruny Island carry toxoplasmosis (a parasite which infects and kills many animals when bitten), of which marsupials are particularly susceptible.Competition with other invasive species is also of concern, for example the endangered masked owl ("Tyto novaehollandiae castanops") is forced to compete with feral honeybees and starlings for nest hollows.