In UK alot do this to game birds they've shot, they reckon it makes the game birds/ meat more tender and flavoursome.Is it a wife's tale? In Canada we are told that European's hang their birds until they fall off at the neck? Then they are green and rotten and the meat is sweet apparantly? Yuck if it's true.
In my opinion it just tastes like disgusting rancid meat....... and it's absolutely fowl!