and then there were 8

So the ducks have had a few days in their new enclosure.  It needs a bit of work - eg a pond  digging out so they have access to water.
but this morning there were 8, not 10.

And there was this

Going round the fence there was this - beware , if you are of a weak constitution

We assume the stoat managed to drag the other missing , smaller , duck through a gap  and came back for the bigger one, which wouldn't pass under the wire. 

This is the hole we found  so assume it got in here.

Stoats in orkney is a recent, increasing  problem .