During their visit at the savannah, the gang is taken to Haijilikani Wadi by Ignatius Ukareamü, who then mentioned that to cross it, a highly unconventional vehicle would be needed.
With this in mind, Phineas and Ferb, along with the rest, created a robot vehicle that worked as that: a highly unconventional vehicle. They built the vehicle with some animal parts in consideration, like gorilla hands and the neck of a giraffe.
Once the gang managed to cross the gorge, a single mistake by Buford caused them to get off the machine and then hang on some vines for their lives.
The vehicle is not seen again until near the end of the second part, where it is taken, along with Carl's destroyed robots back to the O.W.C.A. headquarters.
The vehicle has the body of a lion, the neck of a giraffe, the trunk of an elephant, the arms and hands of a gorilla, the lower half of a cheetah and a monkey tail.
According to the song based after it, they were originally supposed to add a snake for the tail and the engine is "fashioned after baboon adrenal glands."