On January 2006, World’s Smallest Fish: 7.9 mm (0.3-inch) long, was discovered on the Indonesian island of Sumatra
On January 2006, World’s Smallest Dog: At 1.4 pounds and 4.9 inches tall holds the Guinness World Record for the world's smallest living dog (by height).
World's Smallest Snake: 10.1 cm (4-inch) long, Leptotyphlops carlae is the world's smallest species of snake, with adults averaging just less than four inches in length.
World’s Smallest Cattle: 81 cm (31-inch) height, the world’s smallest cattle is a rare breed of an Indian zebu called the Vechur cow. The average height of this breed of cattle is 31 to 35 inches (81 to 91 cm).
World's Smallest Hamster: 2.5 cm (0.9-inch) tall, only slightly bigger than a 50p piece, Peewee is the smallest hamster in the world. Weighing less than an ounce
World’s Smallest Horse: 43.18 cm (17-inch) tall, the little horse was born to Paul and Kay Goessling, who specialize in breeding miniature horses, but even for the breed Thumbelina is particularly small.