But one photo stood above the rest. Taken in 1934, it shows what appears to be the slender neck of an animal rising from the surface of the water. From the moment it was published in the London ...

On the water, a long, slender neck gave Hesperornis a silhouette similar to a modern-day grebe. It probably fed and bred much like a penguin.

Their “slender” bodies have a “mite pocket” on their neck and two more pockets near their tail. Mite pockets are skin folds on a lizard’s body where mites will live and feed, according ...