This document introduces the levels of biological classification from kingdom to species. It provides examples at each level, including choosing a mouse, jellyfish and cheetah for kingdom (Animalia), a snake, bird and falcon for phylum (Chordata), a deer, seal and fish for class (Vertebrata), a leopard, fox and cat for order (Mammalia), a leopard, snow tiger and tiger for family (Carnivora), a cheetah, puma and snow leopard for genus (Feliformia), and a lion for species (Felidae). The document teaches about taxonomy and classifying animals according to their biological traits.