Rotenone is a colorless-to-red, odorless solid. In solution it is used as a broad spectrum insecticide that works by inhibiting the transfer of electrons from Fe-S centers in Complex I to ubiquinone (see electron transfer chain). This prevents NADH from being converted into usable cellular energy (ATP). Rotenone is commonly used in powdered form to reduce parasitic mites on chickens and other fowl. It also stuns or kills fish and is used to eradicate exotic fish from their non native habitats. It is toxic to humans and other mammals. However, it breaks down when exposed to sunlight and has a short lifetime (a week or less) in the environment.