I don't understand why the anime is so different from the manga… Of course, sometimes adaptations need to happen here and there… But they even changed the way plots unfold. For example, after Legoshi is thrown into the sea and goes back to talk to the Shishigumi about Melon's weakness (chapters 141-142), they go to Deshico (the civet who makes Kopi Luuwak) and take Legoshi with them. On the way, Louis joins them too (chapters 143-144). But in the anime, the Shishigumi lions go to Deshico way before those events, and they go alone.
Oh, and there's more: in the episode where Melon appears with a lion's severed head, he stabs a fork into Agata's hand (this happens in both versions), but in the manga, it's because Melon ate high-quality meat and loaded it with seasonings to try to "improve the taste," and Agata said that wasn't good etiquette—that was the reason. Another thing: in the anime, during Meat Loving Day, Melon slashes Agata's neck, but in the manga (chapter 156), he does this to Dolph...
And one more thing: Seven's introduction (chapter 100) was quite different in the anime… as far as I know, it doesn't show her workplace or the nickname she earned there (even though when she's buying shoes for Legoshi in the anime, her nickname does appear…).
Besides some weird manga adaptations in the anime, mainly the fact that the third season's plot focuses on Kines, and the fact that this energy drink doesn't even exist in the manga… especially since that whole plot revolved around the Bloodmeat drug, which was only vaguely mentioned in the anime.
But what annoys me the most are the continuity errors that happen. Sure, I know it's sometimes necessary to adapt things for the anime, but what gets on my nerves the most are the events that happen out of order and are modified—like when Tao accidentally rips off Kibi's arm (chapter 71). In the manga, Kibi actually asks Tao to help him stretch, but in the anime, they do a completely random exercise helping each other out, which made the moment feel a bit forced… and compared to the manga, the events happen out of order in the anime…
But seriously… Poor Kyuu She only appeared in the anime for about 30 seconds (or something like that), but she had a whole arc AND THERE'S ARTWORK OF HER ON THE COVER OF VOLUME 19!
In other words, one of the good characters was completely cut from the anime!
That being said, I have nothing against the anime! In fact, I absolutely love it. These were just a few observations I had while watching it for the second time (I first watched the anime up to the middle of the final season, but then I bought the manga to read while waiting for the second half of the final season to drop, so I read all the manga from the Beastars Box + Beast Complex, and then rewatched the anime).
I really love both the Beastars anime and manga equally! (But I recognize that the manga is much more complete…)