The month of September is almost over and that means big things for Animal Crossing players. The new month brings new items, new events, new critters and more, so the countdown is officially on. Additionally, the next month brings an official look at the Roost update beyond the short teaser shown in the latest Nintendo Direct. The next month is going to be a big one, but there's still plenty to focus on in the meantime.Critters come and go in Animal Crossing, always at the beginning of a month. There are new fish, sea creatures, and insects that arrive on the first day of every month, but to make space for them, others have to leave. Here's a list of the critters that are expected to leave at the start of the new month.Critters leaving Animal Crossing when October arrivesThere is a long list of fish that will be leaving in the month of October, so players should prioritize these before they leave. They represent some of the most lucrative fish in the game.Crawfish- 200 bellsSoft-shelled turtle- 3,750 bellsSweetfish- 900 bellsSalmon- 700 bellsKing salmon- 1,800 bellsNibble fish- 1,500 bellsPiranha- 2,500Arowana- 10,000 bellsDorado- 15,000 bellsGar- 6,000 bellsArapaima- 10,000 bellsSaddled bichir- 4,000 bellsClown fish- 650 bellsSurgeonfish- 1,000 bellsButterfly fish- 1,000 bellsPuffer fish- 250 bellsBlue marlin- 10,000 bellsOcean sunfish- 4,000 bellsSaw shark- 12,000 bellsHammerhead shark- 8,000 bellseyes_6064@eyes_6064Woot! Caught my first Hammerhead shark 🦈 in Animal Crossing 😱7:42 AM · Dec 30, 20206Woot! Caught my first Hammerhead shark 🦈 in Animal Crossing 😱 https://t.co/AAUnGDtBsiGreat white shark- 15,000 bellsWhale shark- 13,000 bellsSuckerfish- 1,500 bellsHere are the bugs that are leaving after September.Tiger butterfly- 240 bellsEmperor butterfly- 4,000 bellsAgrias butterfly- 3,000 bellsRajah Brooke's birdwing- 2,500 bellsQueen Alexandra's birdwing- 4,000 bellsAtlas moth- 3,000 bellsMadagascan sunset moth- 2,500 bellsGrasshopper- 160 bellsWalker cicada- 400 bellsPondskater- 130 bellsDiving beetle- 800 bellsGiant water bug- 2,000 bellsTrevor J. Mitchell@TJM613every other insect in animal crossing: here's this nice little box with some dirtthe giant water bug: i found a bucket hope that works11:42 AM · Apr 8, 2020111every other insect in animal crossing: here's this nice little box with some dirtthe giant water bug: i found a bucket hope that works https://t.co/4VHysENbr2Rosalia batesi beetle- 3,000 bellsEarth-boring dung beetle- 300 bellsGoliath beetle- 8,000 bellsRainbow stag- 6,000 bellsWalking leaf- 600 bellsMosquito- 130 bellsFinally, here are the deep sea creatures in Animal Crossing that are leaving.Sea grapes- 900 bellsSea urchin- 1,700 bellsSlate pencil urchin- 2,000 bellsMoon jellyfish- 600 bellsGigas giant clam- 15,000 bellsThe Gigas Giant Clam is one of the most profitable deep sea creatures (Image via Nintendo)Tiger prawn- 3,000 bellsHorseshoe crab- 2,500 bellsFlatworm-700 bellsAnimal Crossing players are advised to make the best of the remaining few days of September and catch these critters while they still can!