Variant
From PinataIsland.info, the Viva Piñata wiki
Every species has three color variants which must be discovered through various means. For example, if you feed a Turnip to a Whirlm, it changes color to a purple Whirlm.
In addition to their color variants, some species are also able to evolve into a different species. For example, if you feed a Buttercup to a Sparrowmint it becomes a Candary. Another well-known example is a Horstachio turning into a Zumbug after eating blackberries and daisies, as seen on the Horstachio of a Different Color TV episode.