deer, elk, moose......... this type of animal and possom have hollow hair. They will float best, you can also use a bunch of CDC under the wing.
To get good wing shape and stop it from spreading too much make one loose wrap around the hair stack (dont include the hook!) then right infront make another wrap including the hook slightly tighter then beside this one one more wrap as tight as you would normally tie (it should look like a step) the rest of the small head you form should not be on top of thease wraps or you will loose the wing shape the head shape is formed by the splayed hair butts
and dont forget to cement the head wraps.