Bird mite / Rodent mite
Scientific Name: Ornithonyssus spp. / Dermanyssus spp.
Order & Family: Order: Mesostigmata, Family: Macronyssidae / Dermanyssidae
Size: 0.5 mm to 1 mm (barely visible to the naked eye as moving specks)
Natural Habitat
Typically found in bird nests (under eaves or in chimneys) or rodent nests. When their natural hosts are gone, they migrate into human living spaces.
Diet & Feeding
Blood of avian or mammalian hosts. While they may bite humans, they cannot survive or reproduce on human blood alone.
Behavior Patterns
Highly mobile and nocturnal; they remain active at night looking for a host. They often enter homes through cracks, vents, or windows near infestation sites.
Risks & Benefits
Risks: Bites cause intense itching, red welts, and potential skin irritation. They can cause significant psychological distress. Benefits: None to humans; they are parasites.
Identified on: 4/26/2026