OK So I have about 20 ducklings in the brooder. Well I had them on paper towels then hay...well they are about 2 weeks old now so I switched them to pine shavings just now....they seem to be eating them. What do I do? Will it hurt them? I know everyone uses pine shavings but I worry because the last time I used them on 5 week old chicks they all just dropped dead. Literally! What do I do I'm worried now!