Bulbasaur are small, squat, vaguely reptilian Pokémon that move on all four legs, and have light blue-green bodies with darker blue-green spots. As a Bulbasaur undergoes evolution into Ivysaur and then later into Venusaur, the bulb on its back blossoms into a flower. In the Pokémon video game series, the Pokédex, a fictional Pokémon encyclopedia, says that the seed on a Bulbasaur's back is planted at birth, and then sprouts and grows larger as the Bulbasaur grows. The Pokédex also states that the bulb absorbs sunlight which makes it grow. For this reason, Bulbasaur enjoy soaking up the sun's rays, and can survive for days without eating because the bulb stores energy. As the Bulbasaur evolve, they become stronger and more powerful. In the Pokémon anime, the character Ash Ketchum has a Bulbasaur who is portrayed as being brave but also stubborn.