Well-known invertebrate scavengers of animal material include burying beetles and blowflies, which are obligate scavengers, and yellowjackets. Obligate scavenging (subsisting entirely or mainly on dead animals) is rare among vertebrates, due to the difficulty of finding enough carrion without expending too much energy. Griffon vultures ( Gyps fulvus) eating the carcass of a red deer in Spain Scavenger is an alteration of scavager, from Middle English skawager meaning " customs collector", from skawage meaning "customs", from Old North French escauwage meaning "inspection", from schauwer meaning "to inspect", of Germanic origin akin to Old English scēawian and German schauen meaning "to look at", and modern English "show" (with semantic drift). The process and rate of scavenging is affected by both biotic and abiotic factors, such as carcass size, habitat, temperature, and seasons. Scavengers aid in overcoming fluctuations of food resources in the environment. Decomposers and detritivores complete this process, by consuming the remains left by scavengers. Scavengers play an important role in the ecosystem by consuming dead animal and plant material. While scavenging generally refers to carnivores feeding on carrion, it is also a herbivorous feeding behavior. Scavengers are animals that consume dead organisms that have died from causes other than predation or have been killed by other predators. White-backed vulture ( Gyps africanus), lappet-faced vultures ( Torgos tracheliotos) and marabou storks ( Leptoptilos crumenifer) feeding on a dead spotted hyena ( Crocuta crocuta).
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