If you want to know the record holder for the smallest animal in the world, then you're in the right place. Brookesia minima or Dwarf Chameleon is one of the smallest animals in the world. The maximum total length is 3.4 cm (1.3 in) for females and 2.8 cm (1.1 in) for males. Males are also more slender than females, and exhibit a hemipenial bulge at the base of their tails.
The Brazilian Gold Frog is also one of the smallest animals in the Southern Hemisphere. Adult Brazilian Gold Frogs measure to only 9.8 millimeters (0.38 inches) in body length. Many have a beautiful golden color, for which they are named. The smallest frogs of the Northern Hemisphere are the Cuban Eleutherodactylus iberia, which can be two-tenths of a millimeter smaller, and Eleutherodactylus limbatus, of which fully mature adults as small as 8.5 mm (0.33) have been found.
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It's important to mention that the dwarf pygmy goby (Pandaka pygmaea) is also one of the smallest fish in the world by mass and is also one of the shortest freshwater fish as well. Mature males can reach up to 1.1 cm, while the females can grow up to 1.5 cm. Average weight is from 4 to 5 mg. It is a tropical freshwater fish of the family Gobiidae. It is known as bia and tabios in the Philippines.