Red Backed Shrike?

In German it is called a "Nine Killer" (Neuntöter) or "Red Backed Strangler" (Rotrückenwürger).

Legend has it that it kills 9 animals (mice, frogs, lizards etc) before it eats one.

"Red Backed Shrike" in English. Once common, it had more or less died out in the UK but in the last few years a few pairs have returned to southern England.