We actually did this project with the 3rd graders in Sept/Oct. I finally got a camera that doesn't lose charge really quickly!
To start out I showed A Slide show on fun facts about Giraffes, their environment, size, what they eat, AND of course images of Giraffes.
We started out with step-by-step instructions on how to draw the giraffe with oil pastels. Then added whatever they thought would be suitable for the background; focusing on what we discussed in the beginning of class.
This lesson took about 2-3 classes to complete.