i remember once an old bitch of mine marking a single earth on a steep banking,anyway off with the lead and in she goes, a few seconds later i hear this bit of commotion then silence,i just got the box out my pocket when my bitch comes out covered in white feathers,she turns an goes back in to return with an egg in her mouth, drops it re/enters to get another,this she did another 8 times!i can only presume it was a shellduck liked it down there.i must say tho,they was tasty!