system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: why squid "meat" is so different from other animals?
gpt
Most meat that we buy from the supermarket comes from vertebrate animals (ie animals with a spine and bones).

Squid however, are a type of invertebrate animals that don't have bones like vertebrates do (except a beak). This means that a squid's flesh has to function for movement and for structure, where a vertebrate animal's flesh only has to provide movement because bones provide structure. As such, a squid's flesh is different from a vertebrate animal's flesh and therefore can have a "chewier" and more "rubbery" feeling when we eat it.

Edit: spelling and phrasing. Thank you to all the culinary experts for pointing out that indeed, squid meat is only rubbery when overcooked.