Marc-Antoine Fardin received the Ig Nobel Prize for research on the study of the “fluidity” of cats. An article devoted to this was called “On the rheology of cats.”
If we take this matter seriously, the fact that cats can pass through almost any gap is explained by the features of their skeletons.
The cat lacks collarbones, which are firmly attached to the shoulder joint. Therefore, the forelimbs are attached to the musculoskeletal system only with the help of tendons.
For this reason, cats can crawl almost anywhere and also land on their paws at any time. In addition, the spines of these animals are very flexible, which makes them very “fluid”.
Source: Ferra

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