What's killing my chicks? The ducks?

[Cherrystyx]

We had several chickens 3 to 8 weeks old and some ducks 3 to 7 weeks old we got one coop finished and put them all in there together we keep finding several dead chickens and one one duck the smallest one .....what is killing them are the 2 bigger ducks doing it?

They dont seem to really have been attacked i noticed a few feathers missing on one maybe but im not certain

 

[GGBEAR]

Im dumbfounded by this I have never heard of ducks killing chickens but I suppose it could be possible but if they have enough room in the coop I can't understand why.
I'm dealing with loss my self today a Fox killed all 5 hens this morning took 3 and left 2 behind hardley any feathers missing just their heads.
Hope u solve the problem

 

[enola]

They are at the age to be very susceptible to coccidiosis. I would try treating all of them with Corid, ASAP.

 

[Cherrystyx]

Do i need to treat the coop and run or anything?