Different species of mites affect different species of birds. Knemidokoptes is most frequently found in budgies but has been also reported in other species of birds. The lesions develop very slowly, so that an infected bird may appear normal for a long period of time. It is thought that these mites are acquired in the nest, with the infection remaining latent for a long period of time. Tiny nonitching wartlike lesions appear at the commissures of the beak or around the cere.
Advanced infestation spreads to the unfeathered parts of the body.
The involved beak and skin develop a roughened honeycombed appearance consisting of tiny pits and tunnels. The beak becomes distorted as the mites affect the zone of growth. Many birds will require life-long beak trims and shaping. Canaries and finches more commonly have their legs and feet affected by these mites. Their legs become scaly and crusty and their claws become overgrown and cracked.