“Cats have anatomy similar to the other members of the genus Felis. The genus has extra lumbar (lower back) and thoracic (chest) vertebrae. This helps to explain the cat’s spinal mobility and flexibility. Unlike human arms, cat forelimbs are attached to the shoulder by free-floating clavicle bones. These allow cats to pass their body through any space into which they can fit their heads.”
“any space into which they can fit their heads”
And their whiskers serve as a measuring tool.
Thank you RY23☺
Always wondered how cats can slip under doors!