| Smallest, Largest | Group | Classification |
| Baikal, Southern Elephant | |
| Vaquita, Blue | |
| Sun, Brown | |
| Baluchistan Pygmy Jerboa, Capybera | |
| Black-footed, Siberian Tiger | |
| Buff-faced Pygmy, Hyacinth Macaw | |
| Cotton pygmy, Canada | |
| Patu digua, Giant Huntsman | |
| Fennec, Grey Wolf | |
| Pygmy Marmoset, Southern Muriqui | |
| | Smallest, Largest | Group | Classification |
| Dwarf Lantern, Whale | |
| Speckled Padlope, Asian softshell | |
| Elf, Eurasian Eagle | |
| Kitti's Hog-nosed, Giant Golden-crowned Flying-fox | |
| Least Weasel, Giant Otter | |
| Brazillian Gold, Goliath | |
| Pea, Japanese Spider | |
| Thread, Anaconda | |
| Pudu, Moose | |
| Little Blue, Emperor | |
|