look at the wood pigeons nest if you can you will see its 2 eggs from the ground and it uses silver birch twiggs what i have noticed when i use them is all the dust scale etc from youing ones falls right through the nest to the bottom of pan were as with nest felts its kept in the pan cut them 6 inches long and they dont pierce the young birds it gives them firm footing in the nest no splayed legs ,try it