I can't really answer that, because you need to tell me which level. But i can tell you that there are 3 pink ducks in every level. You need to put some water on them to receive them. That is all i can tell you right now. Hope this helped a bit!
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To get the duck in the water on mission 9,put the transmitter with it.Then,go to the iceberg and put it in the water.
bird and water
duck
You buy the rubber duck, (which is sometimes available in the catalog, or you can unlock it through a code.) Then you go to the cove where nothing else but the duck is there. Go in the water area and swim.
This is where you can look at your inventory: http://www.marapets.com/market.php