Materials: cardboard, crayons, meat cutters, hot melt adhesives, straws.

1. Design the trajectory on the cardboard with a pen.

2. Carve a path through the straw with a meat cleaver.

3. Cut the straw into small pieces and the cardboard into small pieces.

4. Stick the straw and cardboard together with hot melt adhesive.

5. Put the glued straw in the track.

6. Stick the bottle cap on the straw with hot melt adhesive.

7. Draw food and corresponding small animals at the end of the bottle cap and track.