 In felids, there are differences between small- and large eyed species.The domestic cat "(Felis sylvestris domesticus)" has vertical slit pupils, its large relative the Siberian tiger "(Panthera tigris altaica)" has circular pupils and the Eurasian lynx "(Lynx lynx)" is intermediate between those of the domestic cat and the Siberian tiger.A similar difference between small and large species may be present in canines.