Which came first, the chicken or the duck egg?

After the winter vacation, Matthew (one of our student-friends) was really thoughtful and brought fresh eggs for me, Katie, Dave and the Rice family all the way from his village. The eggs were wrapped up and tied together with straw to make a great homemade egg carton. We realized after we got them that they were duck eggs, not chicken eggs. At first I was a little unsure about using duck eggs instead of chicken eggs, but it turns out they're pretty much interchangeable. Victoria even made deviled eggs out of the duck eggs and none of us could taste the difference. We did notice that the shells were much harder to crack and that the yolks were bright orange and slightly bigger. We ended up using them in scrambled eggs, cookies, scones, deviled eggs, and boiling them to put in tuna salad. Never expected I'd be cooking with duck eggs.