Day three on my nine goose eggs, and only one showing the tiny dark spot I'm looking for. I'll give them seven days of course, but...

Well I guess if if it turns out there's only one (if it makes the journey successfully) it can be with the ducklings. By the time it hatches they'll likely be almost as big as it is.

There're loads of duck itty-bitties doing really well in their incubator next to the goose eggs.
I was looking in
The Book of Geese on fertility. Holderread says not to attempt to incubate eggs from breeding stock under two years old. I've read the whole book but I guess I kind of selectively "forgot" that bit...