Six new guinea pigs are joining the five that first debuted in Happy Pets
a few days ago. All the new colors are named after various foodstuffs. In the image above, from left-to-right, we've got: Blueberry, Cream, Lemon, Plum, Nougat (you can tell the difference between Cream and Nougat since Nougat's got the blue eyes), and Peach.
Of the six, three of these furballs -- Nougat (unlocks at Level 39), Cream (Level 41), and Lemon (Level 43) -- can be bought using coins, instead of 54 Facebook credits.