Females weigh 2.6 g (0.092 oz) and are 6.1 cm (2.4 in) long, and are slightly larger than males, with an average weight of 1.95 g (0.069 oz) and length of 5.5 cm (2.2 in). This is the smallest species of bat and one of the world's smallest mammals. How Are Two Mammals Both Considered the Smallest? Being known for its weight, its average recorded weight lies between 1.2-2.7 grams and is the lightest animal in the world. The Etruscan shrew (Suncus etruscus), also known as the Etruscan Pygmy Shrew and the White-toothed Pygmy Shrew, weighs only 0.04–0.1 oz (1.2–2.7 g).That makes it the world’s smallest mammal when measured by weight, but, at 1.4–2 in (36–53 mm), it loses out to the bumblebee bat for smallest in length. Large mammals on land have been hunted to extinction in some parts of the world, but the ones which remain are now better protected. The bat feeds during short activity periods in the evening and dawn, foraging around nearby forest areas for insects. The bee hummingbird is the smallest living bird. The smallest known bird is Mellisuga helenae, the bee hummingbird. Like all hummingbirds, it is a swift, strong flier. Its coat, ears, and kidney functions have adapted to the desert environment with high temperatures and little water. The Kitti's hog-nosed bat or the bumblebee bat (Craseonycteris thonglongyai) is a vulnerable species of bat that lives in southeast Burma and western Thailand where it can be seen in limestone caves along rivers. The smallest mammal in the world can be determined in two ways; either by the total weight or by the length. The second type of smallest mammal in the world is the one which is smallest in terms of mass and weight. It weighs less than a penny. Classifications History. The bat is not only the smallest bat species but also the world’s smallest mammal. The smallest known mammal is Craseonycteris thonglongyai, the bumblebee bat. Also, its hearing is sensitive to hear prey moving underground. These mammals have thick hair or blubber to keep them warm. It has a reddish-brown or grey coat, with a distinctive pig-like snout. By total mass, the Etruscan shrew, a shrew species, is the smallest mammal, weighing at most two grams. The species which lie in this category is Shrew who mostly resembles to moles. Ungulata is a clade (or in some taxonomies, a grand order) of mammals. The Smallest Mammal In The World . Hyracoidea (hyraxes), Sirenia (sea cows) (dugongs and manatees) and Proboscidea (elephants) were in the past included in a superorder called Paenungulata which was grouped with the ungulata. Others may live in rainforests. Colonies vary in size, with an average of 100 individuals per cave. The world's shortest verified man is Chandra Bahadur Dangi, while for women Pauline Musters holds the record. The two orders of ungulates were the Perissodactyla (odd-toed ungulates) and Artiodactyla (even-toed ungulates). On land the rodents (rats, mice) are hugely successful, more common in numbers than any other mammals. The fennec is the smallest canid species. It mainly eats insects, small mammals, and birds. The smallest mammal in the world is the bumblebee bat (Craseonycteris thonglongyai), weighing in at just barely 2 grams and measuring 1 to 1.3 inches in length, about the size of … Description. At just 54.6 cm (21.5 in), Nepalese-born Chandra Bahadur Dangi was, at the time of his death in 2015, the world's shortest person ever verified. It’s literally the size of a bumblebee.