Larvae also move away from light and often hide in any cavity in order to remain undisturbed. In natural habitats, they can be found on animal carcasses, under bark, and in the webs, nests and burrows of various animals. Larvae of subfamilies Dermestinae and Attageninae (which lack hastisetae), burrow into feeding substrates, pupate in concealed locations, and show fast escape behaviours when disturbed. Larvae of Megatominae (which have hastisetae), do not burrow, pupate where they have been feeding, and their response to disturbance is to stop moving, arch the body and spread the hastisetae. This difference may be because hastisetae would be a hindrance for burrowing larvae. Adult dermestids are known to feed on pollen and nectar. Adults of Dermestes are cannibalistic and will eat young larvae and pupae; this means that when kept in captivity, adults should be placed in separate containers from the immature stages. Economic relevance Urban and stored products Dermestid beetles are destructive to a number of common items. Natural fibers such as wool, silk, cotton, linen, fur, or feathers are much more prone to attack than synthetic fibers. Dermestids also attack chocolate, copra, and cocoa beans. Medical Dermestid hastisetae, both those attached to exuviae and those shed by larvae, cause health problems in humans when inhaled (rhinoconjunctivitis, asthma), ingested in contaminated food (nausea, fever, diarrhea, proctitis, perianal itching) or touched with skin (dermatitis). Forensic Dermestes maculatus, hide beetles, also have the potential to offer investigators an estimation of the time since death in homicide or questionable cases. Similar to the use of flies in forensic entomology, the arrival of D. maculatus to carrion occurs in a predictable succession. Adult D. maculatus beetles generally arrive 5 to 11 days after death. In an attempt to refine this relatively wide range, recent research has repeated arthropod succession studies. These studies are applied to estimate the arrival of various species of Dermestidae after death. Development for dermestids is temperature dependent, and the optimal temperature for D. maculatus is 30˚C. Development data is normalized using Accumulated Degree Days. Dermestids can also be used in cases involving entomotoxicology, where feces and shed larval skins can be analyzed for toxins. Dermestes maculatus collected from raccoon carcass: Genera Dermestidae contains the following 74 genera: Adelaidella Zhou, Ślipiński & Liu, 2020 Adelaidia Blackburn, 1891 Afrothorictus Andreae, 1967 Amberoderma Háva & Prokop, 2004 Anthrenocerus Arrow, 1915 Anthrenus Geoffroy, 1762 Apphianus Beal, 2005 Apsectus LeConte,