In and Оut.
A few days ago, a couple of sparrows living in a hollow in front of my window hatched chicks. Both parents carry food and clean up poop. The chicks are still small, and the insects in the dad's beak are also very small (left photo), but poop is quite like in adults (in the right photo, mom takes them out of the hollow)

Nikon Coolpix P900

Cropped, combined