A moth is an insect related to the butterfly, both being of the order Lepidoptera. Most of this order are moths; there are thought to be approximately 160,000 species of moth (nearly ten times the number of species of butterfly), with thousands of species yet to be described. Most species of moth are nocturnal, but there are crepuscular and diurnal species.
Tineidae is a family of moths in the order Lepidoptera. Collectively, they are known as fungus moths or tineid moths. The family contains considerably more than 3,000 species in over 300 genera. Most of the tineid moths are small or medium-sized, with wings held roofwise over the body at rest. They are particularly common in the Palaearctic, but many occur elsewhere, and some are found very widely as introduced species.
Tineids are unusual among Lepidoptera as the larvae of only a very small number of species feed on living plants, the majority feeding on fungi, lichens and detritus. The most familiar members of the family are the clothes moths, which have adapted to feeding on stored fabrics. The most widespread such species are the Common Clothes Moth (Tineola bisselliella), the Case-bearing Clothes Moth (Tinea pellionella) and the Carpet Moth (Trichophaga tapetzella); the Brown-dotted Clothes Moth (Niditinea fuscella) despite its name preferentially feeds on feathers in bird nests.
One remarkable genus is Ceratophaga, whose members feed exclusively on pure keratin in the form of the horns and hooves of dead mammals and even the shells of dead tortoises.