Bird Mite or Rodent Mite
Scientific Name: Ornithonyssus spp. or Dermanyssus spp.
Order & Family: Order: Mesostigmata; Family: Macronyssidae or Dermanyssidae
Size: 0.5 mm to 1 mm (extremely small, often appearing as moving specks of dust or sand)
Natural Habitat
Found in bird nests (including eaves and vents) or rodent nests; can migrate into indoor living spaces when hosts die or leave.
Diet & Feeding
Blood of avian or rodent hosts; they may bite humans if their primary host is unavailable, though they cannot survive solely on human blood.
Behavior Patterns
They are semi-permanent parasites that are most active at night; they crawl rapidly and can sense heat and CO2 to find hosts.
Risks & Benefits
Risks include intense itching, dermatitis, and skin irritation from bites; they do not typically transmit diseases to humans but can cause significant stress. There are no ecological benefits to humans.
Identified on: 3/25/2026