this post was submitted on 20 Apr 2024
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Most animals are insects, and their 'brains' are actually distributed across their bodies, although with the largest cluster in the head. Sponges, jellyfish and worms also have a decentralised 'brain' - if you can even call it that. Many other animals - octopi and starfish, for example, have a relatively 'central' brain. Vertebraetes do have their brains in their head, possibly because having it close to the main sense organs can allow for faster reactions.