Our mother duck (Blue Swede), brooded a large nest of eggs (12) and now they are hatching. She has been good with the first one, but is now attacking the others, that are only a couple of hours old. ..pecking at them very forcefully. Now what? It's her first batch (and, she kept re-arranging her eggs and nest, for weeks- taking some eggs out, then putting them back in, and then moving the entire nest around the pen (10 x 10'). Help!