Muscovy-palooza
Songster
I would think that if the rock could fit down her throat it will make it out the other side. Gizzards are tough , if they can swallow snails and turn them into wet poop then there is no reason to doubt the magic that happens inside of a duck. At the rate they grow she probably more space in there than the trunk of a 74 Cadillac within a week! I hope your little rock tumbler mellows out for you.
