Bird Mite (or Rodent Mite)
Scientific Name: Ornithonyssus spp. (Often Ornithonyssus sylviarum or Dermanyssus gallinae)
Order & Family: Order: Mesostigmata, Family: Macronyssidae or Dermanyssidae
Size: Very small, usually barely visible to the naked eye; approximately 0.5 to 1 mm in length.
Natural Habitat
Found primarily in bird nests (pigeons, starlings, sparrows) or rodent burrows. They migrate indoors when their hosts leave the nest or die.
Diet & Feeding
Hematophagous (blood-feeding). They primarily feed on the blood of birds or rodents but will bite humans in the absence of their primary host.
Behavior Patterns
These mites proliferate rapidly in warm, humid conditions. When their host birds fledge and leave the nest, the starving mites migrate into nearby structures (homes, attics) through vents or cracks searching for a new food source.
Risks & Benefits
Risks: Their bites cause intense itching, skin irritation, and rashes in humans (often described as crawling sensations). They are generally not known to transmit diseases to humans but are a significant nuisance pest. Benefit: None to humans or household ecosystems.
Identified on: 3/6/2026