the Caucasus until the 10th century. It lived in Palestine until the Middle Ages, and in Southwest Asia until the late 19th century. By the late 19th century, it had been extirpated in most of Turkey. The last live lion in Iran was sighted in 1942 about northwest of Dezful, although the corpse of a lioness was found on the banks of the Karun river in Khūzestān Province in 1944. It once ranged from Sind and Punjab in Pakistan to Bengal and the Narmada River in central India. Behaviour and ecology Lions spend much of their time resting; they are inactive for about twenty hours per day. Although lions can be active at any time, their activity generally peaks after dusk with a period of socialising, grooming and defecating. Intermittent bursts of activity continue until dawn, when hunting most often takes place. They spend an average of two hours a day walking and fifty minutes eating. Group organisation The lion is the most social of all wild felid species, living in groups of related individuals with their offspring. Such a group is called a "pride". Groups of male lions are called "coalitions". Females form the stable social unit in a pride and do not tolerate outside females. Membership changes only with the births and deaths of lionesses, although some females leave and become nomadic. The average pride consists of around 15 lions, including several adult females and up to four males and their cubs of both sexes. Large prides, consisting of up to 30 individuals, have been observed. The sole exception to this pattern is the Tsavo lion pride that always has just one adult male. Male cubs are excluded from their maternal pride when they reach maturity at around two or three years of age. Some lions are "nomads" that range widely and move around sporadically, either in pairs or alone. Pairs are more frequent among related males who have been excluded from their birth pride. A lion may switch lifestyles; nomads can become residents and vice versa. Interactions between prides and nomads tend to be hostile, although pride females in estrus allow nomadic males to approach them. Males spend years in a nomadic phase before gaining residence in a pride. A study undertaken in the Serengeti National Park revealed that nomadic coalitions gain residency at between 3.5 and 7.3 years of age. In Kruger National Park, dispersing male