I am following an account on twitter explaining Japanes phrases, origin of kanji etc, and they wrote a post about the difference between tori (鳥) and karasu (烏). One of the comments was: "can you explain why the same kanji is in the kanji for squid (鰞)?", and it has been bugging me since. I can't seem to find any info on it googling etc. Does anyone know why?