One form of midden analysis examined the size of fecal pellets in pack rat middens. There are some large coastal middens that have been excavated. They were sunk into mounds of pre-existing prehistoric domestic waste known as middens. Excavations at the site have not revealed significant trash middens indicating residential areas. The only known remains are bone fragments unearthed in Native American shell middens. Evidence of oyster consumption goes back into prehistory, evidenced by oyster middens found worldwide. Numerous remains of huts surrounded by ring middens have been found on the lowland terraces. Fish bones and shells are common in the middens indicating that dwellers ate seafood. Yachats is built on seashell middens and numerous graves left by its past inhabitants. They disposed of the thousands of shells from consumed mussels in middens. Scent marking is primarily through dung middens. Similarly, evidence of fire pits, middens, burial sites, etc. Claw scratching is prominent, and dung middens are typically not formed. Adults are solitary, and mark their territories using anal scent glands and dung middens. These caves tend to be located next to middens and near villages.