December is here in Animal Crossing: New Horizons, which means big changes for the game. Animal Crossing will see an influx of new fish, deep-sea creatures and bugs, which also means that many of the existing critters will be on their way out.Many critters can be very lucrative, so it's worthwhile to try and catch the available ones when they are. Regardless, they all bring in some bells and can be donated to the museum to complete the collection. Here's which ones Animal Crossing players can expect to see now that December has arrived and which ones have left.Critters arriving and leaving in December for Animal Crossing: New HorizonsThe following fish will be arriving or leaving in December for the Northern Hemisphere:ArrivingPond smelt- 500 bellsStringfish- 15,000 bellsSea butterfly- 1,000 bellsSquid- 500 bellsOarfish- 9,000 bellsLeavingPike- 1,800 bellsStringfish will now be available in the Northern Hemisphere (Image via Nintendo)Southern Hemisphere:ArrivingGiant snakehead- 5,500 bellsTilapia- 800 bellsPiranha-2,500 bellsArowana- 10,000 bellsDorado- 15,000 bellsGar- 6,000 bellsArapaima- 10,000 bellsSaddled bichir- 4,000 bellsRibbon eel- 600 bellsSaw shark- 12,000 bellsHammerhead shark- 8,000 bellsGreat white shark- 15,000 bellsWhale shark- 13,000 bellsSuckerfish- 1,500 bellsLeavingCherry salmon- 1,000 bellsChar- 3,800 bellsMiki@zombiemikiPour one out for the whale shark I lost when someone else's switch went into sleep mode #AnimalCrossing #ACNH2:12 AM · Mar 29, 202015915Pour one out for the whale shark I lost when someone else's switch went into sleep mode #AnimalCrossing #ACNH https://t.co/XM1rkUavD5The following bugs will be arriving and leaving in the Northern Hemisphere:ArrivingEmperor butterfly- 4,000 bellsRaja Brooke's birdwing- 2,500 bellsDung beetle- 3,000 bellsSouthern Hemisphere:ArrivingEmperor butterfly- 4,000 bellsFirefly- 300 bellsDrone beetle- 200 bellsGoliath beetle- 8,000 bellsRainbow stag- 6,000 bellsMosquito- 130 bellsLeavingCommon butterfly- 160 bellsYellow butterfly- 160 bellsPeacock butterfly- 2,500 bellsFirefly- 300 bellsLadybug- 200 bellsViolin beetle- 450 bellsPill bug- 250 bellsCentipede- 300 bellsJimmy (formerly Jimbear)@ACNH_JimmyYES!!! Goliath beetle! I will give this to my son tomorrow. <3#AnimalCrossing #ACNH10:12 AM · Jun 3, 20211YES!!! Goliath beetle! I will give this to my son tomorrow. <3#AnimalCrossing #ACNH https://t.co/gz3qPaaWAZFinally, these deep-sea creatures will be arriving or leaving in the Northern Hemisphere for Animal Crossing players:ArrivingLobster- 4,500 bellsLeavingMussel- 1,500 bellsTurban shell- 1,000 bellsSpiny lobster- 5,000 bellsSouthern Hemisphere:ArrivingSea grapes- 900 bellsMussel- 1,500 bellsAbalone- 2,000 bellsGazami crab- 2,200 bellsTiger prawn- 3,000 bellsLeavingChambered nautilus- 1,800 bellsFirefly squid- 1,400 bellsLobster- 4,500 bellsNow is a great time to make a lot of bells with the critter spawns in Animal Crossing.