What breed of ducks do I have

[bell1774]

People have said these ducks are created Indian runner ducks but I'm not sure because of the posture.

 

[Kevin565]

Could be a crested cayuga and crested buff duck.

 

[bell1774]

Could be a crested cayuga and crested buff duck. 

Thanks but daffy the black duck has a limp now and we managed to pick him up and we know which foot and we looked at both feet and there is nothing pointing to the limp so please help.