This vocabulary unit covers common animal-related Spanish words including parts of animals like legs, claws, horns, and tails as well as broader animal categories like fish, amphibians, reptiles, birds, mammals, and insects. Reproductive terms for viviparous and oviparous animals are also defined, along with physical attributes such as scales, fins, gills, fur, feathers, beaks, and antennae. The document provides Spanish translations for key animal vocabulary.