Bird Mite
Scientific Name: Ornithonyssus spp. (e.g., Ornithonyssus sylviarum or Ornithonyssus bursa)
Order & Family: Order: Mesostigmata; Family: Macronyssidae
Size: Very small, approximately 0.5 mm to 1 mm in length. Often barely visible to the naked eye.
Natural Habitat
Bird nests (poultry, pigeons, sparrows, starlings). They often migrate into human homes through windows, doors, or cracks when the original host leaves the nest.
Diet & Feeding
Hematophagous (blood-feeding). They primarily feed on the blood of birds but will bite humans and pests in search of a meal if their avian host is absent.
Behavior Patterns
They are nocturnal and active. If a bird nest is abandoned, thousands of mites can migrate rapidly into nearby structures seeking a new host. They cannot survive long-term without avian blood but can live for several weeks while searching.
Risks & Benefits
Risks: Their bites cause intense itching, swelling, and rashes in humans (sometimes called gamasoidosis). While annoying, they do not typically transmit diseases to humans. Benefits: None in a domestic setting; they are considered parasitic pests.
Identified on: 3/1/2026