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Kitti's hog-nosed bat is small at about 29 to 33 mm (1.1 to 1.3 in) in length and 2 g (0.071 oz) in mass, [2] [3] hence the common name of "bumblebee bat". It is the smallest species of bat and may be the world's smallest mammal, depending on how size is defined.
The bumblebee bat weighs less than a penny and has a wingspan of about 6 inches. Brazilian Free-tailed bats weigh 11-15 g (0.4-0.5 oz). Adults range in size from 79 to 98 mm (7.9-9.8 in) in length.
The Kitti's hog-nosed bat (Craseonycteris thonglongyai), also known as the bumblebee bat, from Thailand and Myanmar [80] is the smallest mammal, at 29–33 millimetres (1.1–1.3 in) in length and 2 grams (0.071 oz) in weight.
The Etruscan shrew has a body length of about 4 cm (1.6 in) excluding the tail. It is characterized by very rapid movements and a fast metabolism, eating about 1.5–2 times its own body weight per day. It feeds on various small vertebrates and invertebrates, mostly insects, and can hunt individuals of the same size as itself.
Microbats constitute the suborder Microchiroptera within the order Chiroptera ().Bats have long been differentiated into Megachiroptera (megabats) and Microchiroptera, based on their size, the use of echolocation by the Microchiroptera and other features; molecular evidence suggests a somewhat different subdivision, as the microbats have been shown to be a paraphyletic group.
However, to move about under one's own power and not be overly affected by the wind requires a certain amount of size. The smallest flying vertebrates are the bee hummingbird and the bumblebee bat, both of which may weigh less than 2 grams (0.071 oz). They are thought to represent the lower size limit for endotherm flight.
The size range of the family is 3 to 13 cm (1.2 to 5.1 in) in head and body length; this excludes the tail, which is itself quite long in many species. They are generally brown or grey in colour, often an indiscriminate appearance as a 'little brown bat', although some species have fur that is brightly colored, with reds, oranges, and yellows ...
Note that the Bumblebee Bat is often credited as the smallest mammal, but it is a little heavier than the Etruscan Pygmy Shrew at 1.5–3.0 g (0.85–1.69 dr); it has a smaller body than the shrew (2.9–3.3 cm/1.14–1.30 in versus 3.6–5.3 cm/1.42–2.09 in), but weighs more because of its wings – naturally the mass of the whole animal ...