Animal Forest(JP) was the Japanese version of Animal Crossing for the Nintendo 64. There was plan for a sequel that included some of the missing features from Animal Forest that were in the English version but were left out of Animal Forest, such as e-Reader bonuses.
Three sequels followed soon after that were released internationally as opposed to this one being a Japan-only release. Animal Crossing for the Nintendo GameCube released in 2002, Animal Crossing: Wild World released for the Nintendo DS in 2005 (It was not released in Europe until 2006.) and Animal Crossing: City Folk (known as Let's Go To The City in Europe.) for the Wii released in 2008.
In 2006, Animal Forest became available to play on the iQue Player with the code 21041.