Used for laying eggs and sheltering the little ones, bird nests vary in shape, size, and type. While some feathered creatures opt for a simple scrape nest by creating a shallow depression in the ground, for instance, others weave intricate ones out of twigs and other materials.

The latter kind often build their wonders of engineering in the most unusual places. They occupy everything from helmets, to car parts, swimming suits, and even traffic lights, and people have pictures to prove it. We’ve gathered some of them in this list today showing that there is no limit to their creativity when it comes to nesting locations. Scroll down to find the pictures and enjoy.

In order to understand bird behavior better and learn more about their process of building nests, Bored Panda got in touch with a professor in the Biology department at Dalhousie University, Andrew Horn. You will find his thoughts in the text below.