I love these birds. They are colorful and very energetic. Their name was nanibird. I also said crazy birds when I saw it :)
They are made with ready-made templates, but once you get the technique, I’m sure you can create your own creative designs.
You download the template, print it, cut it from the edges, fold it and paste it and your crazy bird is ready. You can find the first 4 templates here, and the other template groups from here: 1. group2. group3. group