Very good and very helpful at times... I used similar with a basket.
Remind me when I used three 'House Bricks' propping up the Forth to catch sparrows for the Barn Owls or such.
Mind hated doing it so gave the Hawks / Barn Owls away.
Started off giving the young Owl just meat … But they NEED roughage, Feathers / bones etc. to bring up as pellets, hence …