Q:

Bird identification from feathers - brown-black feathers, medium size, West Sweden

While hiking in western Sweden in October this year, I came across a bunch of feathers on my trail:
To me it looked like the leftovers of a small to medium bird of prey, which was seemingly eaten by a different animal. Here is a closeup of some of the feathers:

The longest feather is about 18 cm long. 
What bird could this be? Is there a possibility to guess/know what has happened to it?

A:

Looks like a female capercaillie to me. What killed it could be anything. Because the feathers seem pretty much intact I'd suspect a bird of prey like a goshawk. Here is a picture of a female capercaillie, the tail feathers match up. 

See Western capercaillie.  the bird is found across Eurasia, and definitely in Sweden.

