They have amazingly tough skin for their size, and they can be mounted conventionally - especially if they are in good shape - but the ones I have done most recently were all slipping by the time I got them. (Thankfully, I received a bag full of them, with "salvage two if possible" as the only directions.) That meant that I couldn't invert their heads without losing most of the nape feathers, so I ended up using a hybrid method, in between mounting and embalming. They still look fine several years later, so I guess it worked !

I prefer to mount them normally, but ya gotta do whatcha gotta do.
They are TEEENY! It's best to mount them wet and then gently blow them dry after they are on the form.