1. The document outlines a science lesson plan about grouping animals according to their external features. 2. The lesson plan involves students discussing and constructing a table of external features, recording features of different animals, and grouping animals with similar features. 3. As an example, the lesson provides a table comparing the external features of horses and cows, listing their similarities like having four legs and tails, as well as differences like cows having horns and horses having manes.