CHAMELEONS: An employee displays the world's smallest Pygmy Leaf Chameleon at Tokyo's Sunshine International Aquarium in January 2002. The chameleon is a rare species from Madagascar measuring only one inch in length and weighing only three grams.

COWS: A three day old Indian Zebu calf gets its first taste of milk from a bottle. At three-feet tall and about 300 pounds, these gentle, hardy cattle common to India and Asia are gaining popularity as low-maintenance novelty pets for rural homeowners in the United States. The world's smallest cattle (not shown) is a rare breed of the Indian Zebu called the Vechur cow.

World’s Smallest Cat: 15.5 cm (6.1-inch) high and 49 cm (19.2-inch) long

World’s Smallest Cattle: 81 cm (31-inch) height

World's Smallest Chameleon: 1.2 cm (0.5-inch) long

World’s Smallest Dog: 12.4 cm (4.9-inch) tall

World’s Smallest Fish: 7.9 mm (0.3-inch) long

World's Smallest Hamster: 2.5 cm (0.9-inch) tall

World’s Smallest Horse: 43.18 cm (17-inch) tall

World's Smallest Lizard: 16 mm (0.6-inch) long