After you've done this, explain that not every bird will fit inside, and the ones which do not make it need to take a seat on the side and watch until the end. Remind them that there should be no pushing. At this point, assign half of the students still standing to be weaker, disadvantaged birds. At the end of this round, have the students discuss which participants were able to successfully migrate and why. Continue this game until only two birds can fit in each circle.
Evaluation Have the students sit in a circle.
Ask what is the word used to describe a species whose population is completely gone. In the activity just played, two animals were left. Ask what circumstances would lead them to becoming extinct. Ask the students to name as many endangered and extinct species as they can.