Bumblebee Bat (Craseonycteris thonglongyai): Also known as the Kitti's hog-nosed bat, it is the smallest mammal in the world. It weighs only about 1.5 to 2 grams and has a body length of approximately 29 to 33 millimeters.
Etruscan Shrew (Suncus etruscus): This tiny shrew is considered the smallest living terrestrial mammal. It weighs around 1.8 to 2.7 grams and has a body length of about 36 to 53 millimeters.
Pygmy Marmoset (Cebuella pygmaea): Found in the rainforests of South America, this small primate is the world's smallest monkey. It weighs about 85 to 140 grams and has a body length of approximately 117 to 152 millimeters.
Bumblebee Mouse (Mus minutoides): Native to southern Africa, this small mouse weighs around 3 to 6 grams and has a body length of about 44 to 63 millimeters.
Kitti's Hog-Nosed Bat (Craseonycteris thonglongyai): Also known as the Bumblebee Bat, it is the same species as the smallest mammal mentioned earlier. It weighs around 1.5 to 2 grams and has a body length of approximately 29 to 33 millimeters.
Smoky Bat (Furipterus horrens): Found in Central and South America, this bat weighs about 3 to 6 grams and has a body length of approximately 41 to 48 millimeters.
African Pygmy Mouse (Mus minutoides): Native to parts of sub-Saharan Africa, this tiny mouse weighs around 3 to 12 grams and has a body length of about 50 to 90 millimeters.
Pygmy Jerboa (Salpingotulus michaelis): Found in parts of Kazakhstan, China, and Mongolia, this small rodent weighs about 3 to 5 grams and has a body length of approximately 48 to 53 millimeters.
American Pygmy Shrew (Sorex hoyi): Native to North America, this shrew weighs around 2 to 6 grams and has a body length of about 56 to 75 millimeters.