Guinea pigs are FAT creatures. They eat. They horde food. They like to eat HAY, PELLETS, CUCUMBER, CARROTS and, last but not least, YOUR FINGER! Don't get me wrong. They are cute and cuddly and fluffy and fun to play with, but they hold a dark secret. This cuteness is actually an adaptation so that people will pet it more. And if more people pet it, it has a better chance of surviving...off your finger.