19what is the world's smallest mammal?

The Etruscan shrew weighs 2 grams or less. However, like all shrews, it has an extremely rapid metabolism and eats twice its weight every single day. Although it is the lightest mammal in terms of average weight, the Etruscan shrew is 2 inches long. According to Sci Tech Daily, the Kitti's hog-nosed bat, or the bumblebee bat, is only 1 inch long, making it about the same length as the bumblebee it is named for; the average weight of a Kitti's hog-nosed bat is also about 2 grams

 The Etruscan shrew has a body length of about 4 centimetres (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. These srhews prefer warm and damp climates and are widely distributed in the belt between 10° and 30°N latitude stretching from Europe and North Africa up to Malaysia. Although widespread and not threatened overall, they are generally uncommon and are endangered in some countries

 Etruscan shrews live alone, except during mating periods. Their lifespan is estimated at typically around two years, but with a large uncertainty. They protect their territories by making chirping noises and signs of aggressiveness. They tend to groom themselves constantly when not eating, and are always moving when awake and not hiding. The hiding periods are short, and typically last less than half an hour. Clicking sounds are heard when these shrews are moving, which cease when they rest. The shrews are more active during the night when they make long trips; during the day, they stay near the nest or in a hiding place.They reach their maximum level of activity at dawn.