Print available for a limited run here: Storenvy
If 'fat bird' was a specific type of Pokemon, these five from each generation would fit the bill, (haha get it, fit the... nevermind). Hoothoot seems to have eaten a weird berry.
Done in blue mechanical pencil on bristol, copic multiliners, and Photoshop CS2.
Grass Starters: [link]
Water Starters: [link]
Fire Starters: [link]
Electric Rodents: [link]
Pokemon © Nintendo, Gamefreak Inc.
Art by ~zimmay