<P> The paws of the cheetah are narrower than those of other felids . The slightly curved claws lack a protective sheath and are weakly retractable (semi-retractable). This is a major point of difference between the cheetah and the big cats, which have fully retractable claws, and a similarity to canids . Additionally, the claws of the cheetah are shorter as well as straighter than those of other cats . Absence of protection makes the claws blunt; however, the large and strongly curved dewclaw is remarkably sharp . </P> <P> Cheetahs are diurnal (active mainly during the day), whereas leopards, tigers, and lions are nocturnal (active mainly at night); diurnality allows better observation and monitoring of the animal . Hunting is the major activity throughout the day; peaks are observed during dawn and dusk indicating crepuscular tendencies . Groups rest in grassy clearings after dusk, though males and juveniles often roam around at night . The cheetah is an alert animal; individuals often inspect their vicinity at observation points such as elevations . Even while resting, they take turns at keeping a lookout . </P> <P> Apart from the lion, the cheetah is the only cat that is gregarious; however, female cheetahs tend to remain solitary . Tim Caro, of the University of California, Davis, identified the various social classes and their longevity . Pregnant and nursing females, a few adolescents, and males who have not joined any groups are typically solitary . Non-lactating females, their cubs, adolescent siblings, and several males will form their own groups . A loose association between individuals of the opposite sex can be observed during the breeding season . These social groups typically keep away from one another . </P> <P> Adult males are typically gregarious despite their territoriality, and may group together for life and form "coalitions". These groups collectively defend their territories . In most cases, a coalition will comprise brothers born in the same litter who stayed together after weaning . However, if a cub is the only male in the litter, then two or three lone males may form a small group, or a lone male may join an existing group . Males in coalitions establish territories that ensure maximum access to females . Solitary males may or may not be territorial . Some males alternate between solitude and coalitions, whichever ensures encounters with a greater number of females . Although a coalition, due to its larger membership, demands a greater amount of resources than do the solitary males or their groups, the coalition has a greater chance of encountering and acquiring females for mating . </P>

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