The loonlike duck

On topic of the fowl of the Cretaceous, modern research has been pondering... Antarctica. As of 69Mya, Australia and Antarctica were separated by not-much; they both had territory inside the then polar circle. Zealandia also existed, I think.

Antarctica was famously not wholly frozen then, because that current was blocked by sufficient land the vortex wasn't strong. But the winters were just as dark. So these continents were seasonal; their forests still coniferous, like the southern Andes.

That means the continents housed a prime spot for the new migratory birds, like those South Pacific guano islands, except more so. We are now learning what sort of birds. The answer is not "penguin" - they had waterfowl. But not As We Know It.

It's more like a diving loon. So I guess these lakes had a lot of crawly crabs and shrimps, down where physics says nonfrozen water resides through the winters.