One of my ducklings (about a week old) has an eye that is just a little bit mattery. I noticed it yesterday, but just thought it had been into some kind of a mess. Today I looked at it a little more closely and discovered that it is kind of "goopy". I took a wet cloth and gently wiped the eye area. After a few hours I checked on it again and it is still a little 'goopy'. Is there something else I should be doing? What do you think would cause this problem? Would it be contagious to the other ducks?