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|Game(s)||Banjo-Kazooie: Grunty's Revenge|
|World(s)|| Cliff Farm|
|Special abilities||Can chew through ropes and chains, can fit into small doors|
Mouse Banjo is the transformation found in Cliff Farm after beating Klungo for the first time. In this form, Banjo can chew through switches and other objects, as well as fit through small holes. If Mouse Banjo enters water in this form, he dies.
His chewing move is used to free the breegulls in Breegull Beach. The mouse can also enter the sand castle in Bilge Haven (an area within Spiller's Harbor) and also the block of ice near Mumbo's Pad in Freezing Furnace. This is the first transformation in the game.
- Mouse Banjo is the only transformation in Banjo-Kazooie: Grunty's Revenge that doesn't have an attack.
|Banjo-Kazooie Transformations:||Termite Banjo · Crocodile Banjo · Walrus Banjo · Pumpkin Banjo · Bee Banjo · Bottles' Bonus Alterations · Washer Banjo|
|Banjo-Tooie Transformations:||Stony Banjo · Detonator Banjo · Van Banjo · Submarine Banjo · T-Rex Banjo · Washer Banjo · Snowball Banjo · Bee Banjo · Dragon Kazooie|
|Banjo-Kazooie: Grunty's Revenge Transformations:||Mouse Banjo · Candle Banjo · Octopus Banjo · Tank Banjo|