We have two ducklings from TSC - they are just over a week old. Both have been lively and happy until this morning. Jemima is suddenly listless, she is very quiet, not standing, breathing a bit heavy, she has a little reddish ring around one eye and her bill has a bluish tinge to it. Someone left the cat in last night and I'm worried that the cat got to her, because it's so sudden. Any thoughts? What should we do?