Thanks everyone, grandma is even better today!
Here we don't have bobcats, the biggest predator that we have here are foxes, but I just think they didn't do it.
The reason why I thought it was cats is because we have 3 cats that were bor on my neighbour's property where nobody lives and they are completely wild. Nobody ever feeds them, they are always hungry and people could never come near them. And the hen that is killed is actually very small- almost bantam sized.
On the other hand- as much as small she was, I don't think they could drag her anywhere.
Oh and the predator is very clean. I found exactly six feathers and a very small spot of blood.
This is my first predator problem in six years.
this afternoon I realized 1 muscovy duck was missing. I went to the neighboring plot and found just a few feathers. I spoke to the breeder I got her from and he says that it must have been a bird. I don't know when it happened, if at night he says might have been owl (there are 2 kinds of owl in this area) and if at daytime probably hawk. unfortunately I didn't pay attention how many ducks there were in the morning. I left the light on and put the tape over the duck's run. whatever it was it will return. I closed the chicken's pens for the first time after a year and a half and left 1 dog in the big run.