Octopus are invertebrates hence, they obviously lack spinal column and other major bones that forms the structure of their body, and that said they only compose more of muscles that can contract and expand which makes them able to move from space to space with ease regardless of size and position. Their bodies adapt to such change but only for a durationed time.
Octopuses fit into small spaces due to their lack of bones, combined with flexible muscles that allow them to change shape. They can compress their bodies through openings that are larger than their beak, adapting for survival. This unique anatomical structure gives them an advantage in escaping predators and seeking shelter.
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