The question is difficult to answer since new animals of different sizes are born day to day.However,smallest known mammal is Indonesian bumble bee bat(Craseonycteris thonglongya),and the smallest reptile is dwarf gecko.
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So far, it has been known to be an insect by the name of Megaphragma Caribea, also known as the fairyfly.
The smallest animal is the tardigrade which is an eight-legged invertebrate that lives in the water. The smallest mammal might be the Kitti's hog-nosed bat.
The second smallest group in the animal kingdom is the genus
The smallest cell in an animal is the sperm cell. It is specialized for reproduction and is much smaller than other cells in the body.
The pygmy shrew is the smallest mammal and animal in Ireland. It has a length of around 4-5 cm and is found in woodlands, grasslands, and gardens throughout the country.
The smallest animal skeleton in the world is believed to be the Barbados threadsnake (Leptotyphlops carlae), which is a type of snake. The skeleton of this tiny snake measures about 10-15 mm in length.
The smallest animal is the bumblebee bat, which weighs only about 2 grams and measures around 1.1 inches long. The fastest animal is the peregrine falcon, capable of reaching speeds over 240 mph when diving to catch prey.