Great grey shrikes are carnivorous. But they are songbirds, not raptors. They have sharp bills, but no talons. So, they can catch prey like mice, but cannot hold it. So, they often put their prey, like the mouse in this video, on thorny bushes to be able to eat it.
Warden Evert Thomas made this video on 6 January 2015 in the Tweelingen nature reserve.
He tells about this (in Dutch) here.