The tiniest amphibian is the Paedophryne amauensis, a species of frog found in Papua New Guinea, which can grow up to 7.7mm in length.

The tiniest bird is the bee hummingbird (Mellisuga helenae), which is native to Cuba and Isla de la Juventud in the West Indies. It is the smallest species of bird in the world and can grow up to 6.1 cm in length and weigh 1.95 g.

The tiniest mammal is the bumblebee bat (Craseonycteris thonglongyai), also known as the Kitti's hog-nosed bat, which is native to Thailand and Myanmar. It has a body length of about 3-4 cm and a wingspan of about 15 cm, and is considered the smallest mammal in the world by body size.
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