Hummingbird
Hummingbirds are birds native to the Americas and constitute the biological family Trochilidae. They are among the smallest of birds, most species measuring in length. Indeed, the smallest extant bird species is a hummingbird, the bee hummingbird weighing less than .
White-toothed shrew
The outer layer of these shrews' teeth is white, unlike that of the red-toothed shrews. These species are typically found in Africa and southern Europe and Asia. This subfamily includes the largest shrew, the Asian house shrew ("Suncus murinus"), at about 15 cm in length, and the smallest, the Etruscan shrew ("Suncus etruscus"), at about 3.5 cm in length and 2 grams in weight. Shrews are possibly the world's smallest extant mammal (although some give this title to the bumblebee bat). "Crocidura" contains the most species of any mammal genus.