Last night when my son put the ducks in one of our 18 month old girls was not acting normal. She would walk a step or two and then collapse, he said. I went out and she let me pick her up (not normal behavior) but by then she was walking fine. No injuries. Nothing hot on her. Nothing seemed to be painful. Checked legs, wings, crop area, egg area. Breathing ok. Separated her from the flock with some electrolyte water for the night. Came out first thing this morning and she is dead. Any ideas on what it could be? If itās an illness, I would like to catch it before it gets anyone else.