Sounds like a fox. A family of foxes use our garden as a playground - and slaughterhouse- at night. Found last week: 1 squirrel (skin only); 2 pigeons, just the wings remaining; 1 magpie, again only wing feathers; head of a chicken; assorted tennis balls, plus a t shirt and stuffed monkey!
Heatwave now, but what’s the betting…?

Sometimes she leaves just the feathers in the garden too