Nice series of images. I love American coots, especially, and love to watch the parents care for their chicks. I've thrown food to a parent and watch it swim several hundred yards or more to take the food to the nesting parent, who then fed the chicks -- rarely would one of the parents eat the food themselves. My photos of this did not turn out well enough to post to the world, while yours are well exposed, crisply focused, and capture both behavior and beauty. Well, coot chicks may not be beautiful, but they're cute.
CJ