*What characteristics distinguish seals from sea lions? *How can careful observation lead to a better understanding of an animal? *How are seals and sea lions similar and different? Background Our "Seals of Glacier Bay" curricula unit is divided into three lesson plans, each taking one class session to complete. They are part of our "Middle School Scientists" series that explore the fascinating research and resources of Glacier Bay National Park. In this lesson, s tudents, as researchers, observe the similarities and differences between seals and sea lions and create a Venn Diagram to graph th Duration: 60 Minutes.