Worrying about sentience when we kill and eat sapient beings is maybe a step further than most folk are prepared to go.

Cuttlefish and some squid/octopuses appear to have language of a visual kind. Pigs have been known to count to three - which some human societies managed to miss.

Can’t see folk taking calamari or bacon off the menu. But from where I stand living beings/things with language are people; and I’m not in favour of eating them, if you will excuse the understatement.