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Someday, new and updates will go here. In the meantime, here is some filler: Cats have seven cervical vertebrae (as do most mammals); 13 thoracic vertebrae (humans have 12); seven lumbar vertebrae (humans have five); three sacral vertebrae (as do most mammals, but humans have five); and a variable number of caudal vertebrae in the tail (humans have only three to five vestigial caudal vertebrae, fused into an internal coccyx).[61]: 11  The extra lumbar and thoracic vertebrae account for the cat's spinal mobility and flexibility. Attached to the spine are 13 ribs, the shoulder, and the pelvis.[61]: 16  Unlike human arms, cat forelimbs are attached to the shoulder by free-floating clavicle bones which allow them to pass their body through any space into which they can fit their head. The cat (Felis catus) is a domesticated descendant of the wildcat.[1][2] It is the only domesticated species in the family Felidae, and is believed to be derived from historical African wildcats.[4] The cat is commonly referred to as the domestic cat or house cat to distinguish it from the wild members of the family.[5] Cats are commonly kept as house pets but can also be farm cats or feral cats; the feral cat ranges freely and avoids human contact.[6] Domestic cats are valued by humans for companionship and their ability to kill vermin. About 60 cat breeds are recognized by various cat registries.[7] The cat is similar in anatomy to the other felid species: it has a strong flexible body, quick reflexes, sharp teeth, and retractable claws adapted to killing small prey like mice and rats. Its night vision and sense of smell are well developed. Cat communication includes vocalizations like meowing, purring, trilling, hissing, growling, and grunting as well as cat-specific body language. Although the cat is a social species, it is a solitary hunter. As a predator, it is crepuscular, i.e. most active at dawn and dusk. It can hear sounds too faint or too high in frequency for human ears, such as those made by mice and other small mammals.[8] It also secretes and perceives pheromones.[9] Cats have seven cervical vertebrae (as do most mammals); 13 thoracic vertebrae (humans have 12); seven lumbar vertebrae (humans have five); three sacral vertebrae (as do most mammals, but humans have five); and a variable number of caudal vertebrae in the tail (humans have only three to five vestigial caudal vertebrae, fused into an internal coccyx).[61]: 11  The extra lumbar and thoracic vertebrae account for the cat's spinal mobility and flexibility. Attached to the spine are 13 ribs, the shoulder, and the pelvis.[61]: 16  Unlike human arms, cat forelimbs are attached to the shoulder by free-floating clavicle bones which allow them to pass their body through any space into which they can fit their head. The cat (Felis catus) is a domesticated descendant of the wildcat.[1][2] It is the only domesticated species in the family Felidae, and is believed to be derived from historical African wildcats.[4] The cat is commonly referred to as the domestic cat or house cat to distinguish it from the wild members of the family.[5] Cats are commonly kept as house pets but can also be farm cats or feral cats; the feral cat ranges freely and avoids human contact.[6] Domestic cats are valued by humans for companionship and their ability to kill vermin. About 60 cat breeds are recognized by various cat registries.[7] The cat is similar in anatomy to the other felid species: it has a strong flexible body, quick reflexes, sharp teeth, and retractable claws adapted to killing small prey like mice and rats. Its night vision and sense of smell are well developed. Cat communication includes vocalizations like meowing, purring, trilling, hissing, growling, and grunting as well as cat-specific body language. Although the cat is a social species, it is a solitary hunter. As a predator, it is crepuscular, i.e. most active at dawn and dusk. It can hear sounds too faint or too high in frequency for human ears, such as those made by mice and other small mammals.[8] It also secretes and perceives pheromones.[9]