Cat intelligence
The brain of the domesticated cat is about long, and weighs . If a typical cat is taken to be long with a weight of , then the brain would be at 0.91% of its total body mass, compared to 2.33% of total body mass in the average human. Within the encephalization quotient proposed by Jerison in 1973, values above 1 are classified big brained, while values lower than 1 are small brained. The domestic cat is attributed a value of between 1–1.71 relative to human value that is 7.44–7.8. The largest brains in the Felidae family are those of the tigers in Java and Bali, of which the largest relative brain size within the "panthera" is the "tigris". It is debated whether there exists a causal relationship between brain size and intelligence in vertebrates. Correlations have been shown between these factors in a number of experiments. However, correlation does not imply causation. Most experiments involving the relevance of brain size to intelligence hinge on the assumption that complex behavior requires a complex (and therefore intelligent) brain; however, this connection has not been consistently demonstrated.
Wildcat
Compared to other members of the "Felinae", the wildcat is a small species, but is nonetheless larger than the housecat. The wildcat is similar in appearance to a striped tabby cat, but has relatively longer legs, a more robust build, and a greater cranial volume. The tail is long, and usually slightly exceeds one-half of the animal's body length. Its skull is more spherical in shape than that of the jungle and leopard cat. The ears are moderate in length, and broad at the base. The eyes are large, with vertical pupils, and yellowish-green irises. Its dentition is relatively smaller and weaker than the jungle cat's. The species size varies according to Bergmann's rule, with the largest specimens occurring in cool, northern areas of Europe (such as Scotland and Scandinavia) and of Middle Asia (such as Mongolia, Manchuria and Siberia). Males measure in body length, in tail length, and normally weigh . Females are slightly smaller, measuring in body length and in tail length, and weighing .
Both sexes possess pre-anal glands, which consist of moderately sized sweat and sebaceous glands around the anal opening. Large-sized sebaceous and scent glands extend along the full length of the tail on the dorsal side. Male wildcats have pre-anal pockets located on the tail, which are activated upon reaching sexual maturity. These pockets play a significant role in reproduction and territorial marking. The species has two thoracic and two abdominal teats. The wildcat has good night vision, having 20 to 100% higher retinal ganglion cell densities than the housecat. It may have colour vision as the densities of its cone receptors are more than 100% higher than in the housecat. Its sense of smell is acute, and it can detect meat at up to 200 metres. The wildcat's whiskers are white; they can reach 5 to 8 cm in length on the lips, and number 7 to 16 on each side. The eyelashes range from 5 to 6 cm in length, and can number 6 to 8 per side. Whiskers are also present on the inner surface of the wrist, and can measure 3 to 4 cm.