My duck recently had 15 ducks and so far 2 of them have died. One was born with a broken beak and was not fully developed and the other just suddenly became paralyzed and died an hour later(I really don't know what happened). The 2nd ducking was fine but I found it on the ground about 10 minutes after I checked on them last, the duck was limp and couldn't move but its heart was beating and eyes were moving. This is the first time my ducks have had chicks and Im wondering if its normal for some of them to die and what I can do to help the rest.