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.
Spectral bat
The spectral bat is the largest bat species native to the New World and the largest carnivorous bat in the world.
The wingspan typically ranges from .
Its forearm length is .
Its body length is and its mass is .
Its wings, though large in an absolute sense, are short relative to its body size.
The wings are wide, though, creating a large surface area.
Its wingtips are rounded and almost squarish.
The thumbs are long, at .
Each of its thumbs has a large, recurved claw that is grooved, similar to those of cats.
Its back fur is reddish-brown, long, and soft, while its belly fur is shorter and paler.
The forearm is furred on the half closer to the body, but naked on the half closer to the wrist and fingers.
Its molars are narrow with W-shaped crests.
While six of its molars have three cusps, as in many mammal species, the last upper molars are reduced to two cusps; they are much smaller than the other molars.
The talonids (crushing surfaces) of the molars are small relative to their trigonids (shearing surfaces).
The upper canine teeth are well-developed.
Its dental formula is for a total of 34 teeth.
Its skull is narrow and elongated with a pronounced sagittal crest. 
Overall, its skull resembles a miniature canid or bear skull.
Its nose-leaf is large, at in length.
There is no discernible tail, but the uropatagium (tail membrane) is long and broad.
Its legs are long, and the feet are composed of slender bones; each digit has a well-developed claw. The ears are large and rounded, at long.