The body on that march brown doesn't look like extended deer hair.
I have made extended bodies by tying in a short piece of stiff nylon - tying a longer tail to it - then dubbing over the nylon.
Makes a flexible extended body that looks pretty nice
I use the needle style, I take different size needles and then spin dubbing and a flexable glue on it. Then i add what ever I want for the tails and then tie in. I make these ahead of time and store them.