NiMo, 26.8.2005 11:33:
miten kissat kehrää?
Kysyt niin vaikeita että päätin copy pastettaa wikipediasta :D
Scientists still cannot explain how cats purr. One theory holds it involves cats' false vocal cords, which do not appear to have any other function. Another theory involves blood hitting the aorta. Alternatively, purring may be caused by the vibrations of the hyoid apparatus, a series of small bones connecting the skull and the larynx that nominally serves to support the tongue. Larger cat species roar, but don't purr. Small ones purr, but don't roar. Moreover, whilst small cats can purr either during inhale or exhale, larger cat species can only purr during the exhale.