World's Smallest Snake: 10.1 cm (4-inch) longLeptotyphlops carlae is the world's smallest species of snake, with adults averaging just under four inches in length. Found on the Caribbean island of Barbados, the species --which is as thin as a spaghetti noodle and small enough to rest comfortably on a U.S. quarter-- was discovered by Blair Hedges.
World’s Smallest Horse: 43.18 cm (17-inch) tallThe little horse was born to Paul and Kay Goessling, who specialize in breeding miniature horses, but even for the breed Thumbelina is particularly small: she is thought to be a dwarf-version of the breed. At just 60 lb and 17-inch tall, the five-year-old Thumbelina is the world’s smallest horse.
World's Smallest Hamster: 2.5 cm (0.9-inch) tallOnly slightly bigger than a 50p piece, PeeWee is the smallest in the world. Weighing less than an ounce, the golden hamster stopped growing when he was three weeks old - his five brothers and sisters went on between 4in and 5in.
World's Smallest Chameleon: 1.2 cm (0.5-inch) longThe Brookesia Minima is the world's smallest species of chameleon. This one is just half an inch. Found on the rainforest floor of Nosy Be Island off the north-west coast of Madagascar, females tend to be larger than males.
World’s Smallest Cat: 15.5 cm (6.1-inch) high and 49 cm (19.2-inch) long
Meet Mr. Peebles. He lives in central Illinois, is two years old, weighs about three pounds and is the world's smallest cat! The cat's small stature was verified by the Guinness Book of World Records on 2004.