Wasp
Wasps first appeared in the fossil record in the Jurassic, and diversified into many surviving superfamilies by the Cretaceous. They are a successful and diverse group of insects with tens of thousands of described species; wasps have spread to all parts of the world except for the polar regions. The largest social wasp is the Asian giant hornet, at up to in length; among the largest solitary wasps is a group of species known as tarantula hawks, along with the giant scoliid of Indonesia ("Megascolia procer"). The smallest wasps are solitary chalcid wasps in the family Mymaridae, including the world's smallest known insect, with a body length of only , and the smallest known flying insect, only long.
American bison
Two subspecies or ecotypes have been described: the plains bison ("B. b. bison"), smaller in size and with a more rounded hump, and the wood bison ("B. b. athabascae")—the larger of the two and having a taller, square hump. Furthermore, the plains bison has been suggested to consist of a northern plains ("B. b. montanae") and a southern plains ("B. b. bison") subspecies, bringing the total to three. However, this is generally not supported. The wood bison is one of the largest wild species of bovid in the world, surpassed by only the Asian gaur and wild water buffalo. It is the heaviest, and second tallest extant land animal after moose in the Americas.