Bird Mite (likely Tropical or Northern)
Scientific Name: Ornithonyssus spp. (e.g., Ornithonyssus sylviarum or Ornithonyssus bursa)
Order & Family: Order: Mesostigmata, Family: Macronyssidae
Size: Extremely small, approximately 0.5 to 1.0 mm (barely visible to the naked eye as tiny moving specks).
Natural Habitat
Commonly found in bird nests (including eaves, chimneys, and vents) and can enter homes when the avian hosts leave the nest.
Diet & Feeding
Hematophagous (blood-feeders). They primarily feed on the blood of birds but will bite humans if their bird hosts are unavailable.
Behavior Patterns
They are highly mobile and tend to congregate near windows or light sources. They are most active in late spring and early summer when birds fledge. While they can bite humans, they cannot complete their life cycle on human blood alone.
Risks & Benefits
Risks include skin irritation, itching, and dermatitis from bites. They do not typically transmit diseases to humans. Benefits are none to humans; they are considered household pests and environmental parasites.
Identified on: 3/7/2026