This is a great way to introduce a Classifying Living Things Unit. It is something that can be made complicated or complex, just using the basic lesson plan and PowerPoint attached. It covers a lot of content in a short amount of time, BUT the kids get it, and they loved it. Simple, easy, effective. My favorite! The link for the PPT is in the lesson plan.
The activity is to fold a piece of paper into sixths. Each square is dedicated to one portion of the PPT which features mammals, amphibians, fish, birds, reptiles, and arthropods and the students take notes in each section. After the activity ends, the kids play a few rounds of "What am I?" and using their new content vocabulary and notes they must guess what animal they are, chosen by you. The rest of the class interacts by determining "yes" or "no" to the student's yes/no questions. We had a lot of laughs during this and they understood the material well.