In Japan, a census is conducted every five years on all people and households living in Japan. This is considered the most important and basic statistical survey of the country, examining the population and households in the country. Similar statistical surveys are very important in wildlife research, and examining the species, inhabitants, and year-to-year variations occurring in the study area requires both behavioral and sociological changes. Is also significant. However, it is difficult to do it easily when dealing with animals that cannot be surveyed, such as the census. It is a common method to set an investigation area, perform direct observations, investigate traces such as feces, and estimate the number of individuals using camera traps.