I looked up "ornithopter plans" on Google and can up with these plans.
However, I wanted to make an ornithopter with four wings, like this.
So I decided to base my ornithopter on the free bird plans, but modified it to make it four-winged and for use with my bamboo construction materials.
Start by removing some flat bamboo strips from the place mat and laying out the body shapes. I made some triangles. Using a pencil, carefully mark lines where they overlap. Cut along the lines with your dikes. Carefully
clean up the edges with a knife. Glue together with a bit of superglue and spray with accelerator.
Continue for all the joints.