My puppy brought home 2 undamaged mallard duck eggs 2 days ago, both of which were warm upon arrival. We have a pond, and after she brought them home we went down there to the nest, and there are more eggs, and it isn't hidden well (which is common I've heard.) I have them both in a shoebox with a heating pad and a bunch of towels (so they won't cook.) I know they were alive when we first got them, but now I'm not so sure if they are. I've held them up to a light like your supposed to, but with both eggs you can't really see much. They are both a dark tan color, and fit in my hand... supposedly they are mallard duck eggs. So my question is, Will the heating pad keep them alive? Are they dead (how can I tell?) and well.... What should I do!?