the difference between physical and behavioral adaptations.
What Do You Do With a Tail Like This? by Steve Jenkins. In small groups, students create webs to show how different body parts are physical adaptations of animals. We also read "Swim School", an article in the Toolkit Texts 4-5 book.
But my favorite part is working with camouflage. I've uploaded Introduction to Animal Camouflage to both Slideshare and TeachersPayTeachers. As I researched camouflage, I found that there are several different ways to break down the concept. Because our state standards emphasize understanding how adaptations help animals to survive, I tried to put in lots of opportunities for students to talk about this. Enjoy! (And please let me know if you see any problems...my kids found two different typos in things that I had copied for them today, adding insult to the injury of the first day back from holiday break!)