When do they change so you know male from female.
Also, I noticed one had foam coming from its mouth and it kept swallowing and swallowing over and over, it finally went away and the duck seems okay now. Could it be the chicken feed I am feeding them, i noticed it was medicated. They are about 6 weeks old.
Also, why do their breasts swell up, are they eating my fish in my pond?? The pars under their neck/breat area seems to get real big like they swallowed a baseball, what is that??


