Squirtle is a bipedal turtle with its most notable feature being the hard shell on its back. This shell forms and hardens on its back after birth. It could perhaps be distantly related to some other turtle-like Pokémon, such as Torkoal and Turtwig, but Squirtle seems to only be closely related to its evolutions.
Download here! Note that there are more pokemon for download! I’ll add those to the blog later, for archive purposes.