Darwin is a Dinosaur Puffle that Gary adopted in January 2014. He was first seen in-game with Gary during the Prehistoric Party 2014. He is Gary's lab assistant. Darwin is a blue triceratops puffle.
There was a penguin poll for choosing the puffle's name. The names available were Archimedes (Archie), Marsh, Darwin, and Pi.
In all languages, there was substitution of the other names to another scientists and inventors. In Portuguese, Marsh was replaced by Thomas and Pi was replaced by Tesla. In German, Marsh was replaced by Albert. In Spanish, Marsh was replaced by Edison (Ed, Edi). And in French, Marsh was replaced by Watt. This way if Marsh was chosen, the puffle will have a different name in each language, and if the chosen was Pi, it would have a different name in Portuguese only.
Darwin is named after Charles Darwin, a famous naturalist and geologist who created the Theory of Evolution and Natural Selection, among other ideas.