Last night an unknown predator (we think a fox or raccoon) got in to the chicken pen and killed one of our two Giant Pekin ducks, Ava. The evidence is that she fought valiantly. The survivor, Trouble, has been calling for her non-stop since then. He is so sad and it is breaking our hearts. We have him in the house with us now, but he is still barely consolable, naturally. We are concerned because he is vomiting some food (but not all), and his temperature is rather high, and he is frothing a little at the corners of the mouth. Is this to be expected? (All of the chickens were all able to jump up into the trees and escape serious harm.) Sorry for the sad news. Thank you for reading and helping.