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.
Chato Murciano
Along with its short nose, the breed usually has a black or white color and has small sized heads. Generally the head Chato Murciano can grow up to 28.5 cm long and 20 cm wide after reaching 12 years of age. This is only a 2–4 cm growth from when it is one year old. On its head, the snout increases size up to 10.5 cm but then decreases to about 9.5 cm when the pig reaches twelve years of age. Pigs at about 3.5 years or 12 years have their eyes separated from each other at about 16 cm where at 1 year, they are separated by 12.5 cm.