Raptor Hackle or Short Rhea Quills are fantastic for intruder style patterns, saltwater flies and a multitude of other flies.
Raptor Hackle is available in 12 UV Fluorescing colors and 4 feathers come per pack.
Imagine shorter Rhea and you have Raptor Hackle.
You can use a "stripped hackle" method for intruders, a dubbing loop or simply use the feathers for tentacle and tails. Raptor hackle offers great mobility in the water with just the right stiffness for a life like presentation.