Ornithonyssus
- Also called the Northern mite or Northern feather mite
- Closely related to Dermanyssus
- Hairy
- Spends entire life cycle on the host
- Occurs in caged birds and poultry
- Causes feathers to become matted and severe scabbing can develop
- Scabs particularly seen around the vent
- Decreases egg production
- Grey or black discolouration of feathers when large numbers of mites are present