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. This is the smallest species of bat and one of the world's smallest mammals. Others may live in rainforests. Also, its hearing is sensitive to hear prey moving underground. The two orders of ungulates were the Perissodactyla (odd-toed ungulates) and Artiodactyla (even-toed ungulates). The bee hummingbird is the smallest living bird. By total mass, the Etruscan shrew, a shrew species, is the smallest mammal, weighing at most two grams. 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. It weighs less than a penny. The world's shortest verified man is Chandra Bahadur Dangi, while for women Pauline Musters holds the record. How Are Two Mammals Both Considered the Smallest? Classifications History. The bat feeds during short activity periods in the evening and dawn, foraging around nearby forest areas for insects. The smallest known bird is Mellisuga helenae, the bee hummingbird. 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 … 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 species which lie in this category is Shrew who mostly resembles to moles. It mainly eats insects, small mammals, and birds. These mammals have thick hair or blubber to keep them warm. 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. Colonies vary in size, with an average of 100 individuals per cave. Like all hummingbirds, it is a swift, strong flier. 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. The smallest known mammal is Craseonycteris thonglongyai, the bumblebee bat. The Smallest Mammal In The World . The fennec is the smallest canid species. The bat is not only the smallest bat species but also the world’s smallest mammal. Ungulata is a clade (or in some taxonomies, a grand order) of mammals. The smallest mammal in the world can be determined in two ways; either by the total weight or by the length. Its coat, ears, and kidney functions have adapted to the desert environment with high temperatures and little water. 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