Please help ID this duckling!

[buckbye]

I am very new to ducks, these ducklings are my first. I know very little about IDing breeds, esp ducklings, so I'm hoping y'all can help me out! I ordered the Deluxe Runner Assortment and the Bargain Duckling Assortment from Holderread's, and the little guy (or girl) in question was thrown in as an "extra." He or she is now 12 days old, but seems to have barely grown since I received the ducklings on May 8th. As you can see, he or she is much smaller than this White Appleyard shown for comparison, although they are the same age. This little duckling is not shy at all, but rather fearless of humans, and much friendlier than the rest. He or she is also constantly singing a delightful, whistling sort of tune, even while eating. (The others are relatively silent unless they want something.).

So, ducky experts, what breed is this? Is it a runt? A really stunted runner? A bantam breed? All I know is your guess is likely better than mine! I'm beginning to think I have another one who is turning out a bit unlike the others so I'll probably be posting pics of that second duckling later.

 

[SpringPeeper]

They list Australian Spotted on their site, those are pretty small ducks and I think the coloring is similar.

 

[buckbye]

Oooh I looked at some pictures on Holderread's site and I think you're right! (I looked at them before, I don't know why I didn't see the resemblance.) Because the markings aren't very dark, I'm guessing this is unlikely a Green-Headed Australian spotted, but probably a Silver or a Blue?