One doesn’t think of chickens as being nest builders per se, but they definitely do nest construction.
Guineas, ground nesters like chickens, craft quite beautifully careful nests, if extremely minimal ones, out of a few blades of grass. It’s more of a saucer than a bowl – a slight bank to keep the eggs from rolling out, I suppose.
When I set the Silkies on eggs, I think I form a perfect nest in advance, but no. They always clean it right up, to the point of leaving bare floor around the form of their nest.
When a chicken is working up to getting broody, she makes a lovely round bowl out of straw with a thick underpadding. In this case, there wasn’t a lot of material in the coop because it has just been cleaned, but some hen gathered up just about every blade of straw in there and pulled it into her nest purposes.
I wish I knew how this goes down. Foot scratching? Walking with beakfuls? Beak raking?