I have an 8 month old female mallard duck. A few months ago, she had an eye injury which the vet put her on an antibiotic. Her eye is almost completely healed, however, since this illnes, she is acting strange. She is comstanly looking for food. She has access to her pellet and cracked corn 24/7, I am talking about dirt searching for food. All day she gobbles up a mouth full of dirt, runs over to the water bucket, rinses her mouth out, and goes back at it again, like she is starving. Last week, I thought I saw her throw-up, did not think anything of it, until 2 days ago when she was in the pond, and she threw up. It protruded from her mouth like someone was squeezing her stomach. I got to examine some of the throw-up and it was cracked corn, and alot of grit from the mud. A few minutes later, she is find, going about her business.... Please help in any advice that you can possably give.