Oak leaf Gall Mite- (Pyemotes herfsi) - about 0.2mm in diameter, these tiny mites attach themselves to humans and feed. These mites reproduce by paralyzing the larva of other pests and feeding upon them until the female hatches up to 250 adult mites. This mite can paralyze a larva up to 166,000 times its own weight.

Clover or Gooseberry Mite (also known as Red Spider Mite)- (Bryobia praetiosa) - Oval shaped body about 0.7 mm in length and yellowish-green in color. These mites do not damage books directly, but their bodies will stain pages if squashed and also provide nourishment for other pests. Known to swarm into buildings in early to mid Spring to lay their eggs.