This is a good little worksheet for 5th and 6th graders. Kids often ask about chicken eggs: where they come from, how come their are chicks in some of them, why are some of them lacking a yoke, etc. So I decided to make a coloring worksheet that has some science in it. If you want to do a paper dissection of birds after or before this lesson, look for my pigeon paper dissection. This lesson can go with the discussion about human anatomy, etc.