<P> One study on a single cheetah (Acinonyx jubatus) showed it purred with an average frequency of 20.87 Hz (egressive phases) and 18.32 Hz (ingressive phases). A further study on four adult cheetahs found that mean frequencies were between 19.3 Hz and 20.5 Hz in ingressive phases, and between 21.9 Hz and 23.4 Hz in egressive phases . The egressive phases were longer than ingressive phases and moreover, the amplitude was greater in the egressive phases . </P> <P> It was once believed that only the cats of the genus Felis could purr . However, felids of the genus Panthera (tigers, lions, jaguars and leopards) also produce sounds similar to purring, but only when exhaling . The subdivision of the Felidae into' purring cats' on the one hand and' roaring cats' (i.e. non-purring) on the other, originally goes back to Owen (1834 / 1835) and was definitely introduced by Pocock (1916), based on a difference in hyoid anatomy . The' roaring cats' (lion, Panthera leo; tiger, P. tigris; jaguar, P. onca; leopard, P. pardus) have an incompletely ossified hyoid, which according to this theory, enables them to roar but not to purr . On the other hand, the snow leopard (Uncia uncia), as the fifth felid species with an incompletely ossified hyoid, purrs (Hemmer, 1972). All remaining species of the family Felidae (' purring cats') have a completely ossified hyoid which enables them to purr but not to roar . However, Weissengruber et al. (2002) argued that the ability of a cat species to purr is not affected by the anatomy of its hyoid, i.e. whether it is fully ossified or has a ligamentous epihyoid, and that, based on a technical acoustic definition of roaring, the presence of this vocalization type depends on specific characteristics of the vocal folds and an elongated vocal tract, the latter rendered possible by an incompletely ossified hyoid . </P> <P> Mewing is a vocalization of domestic kittens, apparently used to solicit attention from the kitten's mother . The mew is similar to what is described in Brown et al. 1978 as an isolation call . Around 3 to 4 week of age kittens don't mew when at least one littermate is present, and at 4 to 5 months of age kittens stop mewing altogether . </P> <P> The most familiar vocalisation of adult cats is a "meow" or "miaow" sound (pronounced / miˈaʊ /). The meow can be assertive, plaintive, friendly, bold, welcoming, attention soliciting, demanding, or complaining . It can even be silent, where the cat opens its mouth but does not vocalize . Adult cats do not meow to each other, and so adult meowing to human beings is likely to be a post-domestication extension of mewing by kittens . </P>

What other cat i don't see another cat