Human: Who was the first person to propose a classification system for animals? Assistant: 
The first person to propose a classification system for animals was Carl Linnaeus. He proposed a system of classification based on the idea that animals could be grouped by their shared characteristics. He divided animals into two kingdoms: Animalia and Plantae. The Animalia kingdom included all animals, while the Plantae kingdom included all plants. He also divided the Animalia kingdom into three classes: Invertebrates, Vertebrates, and Mammals.