This is a picture of my hidden safari animal. The animal I made was a zebra.
For an extension activity, a teacher could use the hidden drawings to incorporate another subject such as math. The teacher could write up a review game and hand out questions to the students. The answers to the questions could be hidden in the warm colored pictures and posted on a board. The students could work the problems, and once they think they have the correct answer they would put on their glasses to see if what they have is correct. This idea could also be made into a class competition, where you would divide the class up and they would compete to see who gets the correct answer.