"Botulism is one of the most common causes of death in poultry in the TopEnd. Chickens,ducks,geese,guinea fowl and many other birds are susceptible.It can affect free-range and caged birds."
https://nt.gov.au/__data/assets/pdf_file/0010/233569/botulism-in-chickens-ducks-and-others.pdf
https://nt.gov.au/__data/assets/pdf_file/0010/233569/botulism-in-chickens-ducks-and-others.pdf