You can tie the legs with either Super Stretch Body Material rubberlegs, or micro vernille. And the back is Turkey, along with turkey biots for its antennaes. I now use the legs with vernille because is more realistic and looks better. The tail on the olive one is painted with paint, because I couldn't find my green sharpie, but the Rusty Crawdad's tail is painted with a rust colored waterproof marker. Here's the new and improved Rust Paddlin' Crawdad.
And the legs aren't as thick as they look in the photo. And lastly, I got the legs at www.theflyshop.com. Vernille should be sold in every fly shop. The tail is just a piece of a thick ziplock bag cut to the shape of a Crawdad tail.