Shrinkage. Oversized dinos went extinct, whereas little ones—which became birds—survived. When nearly every dinosaur went extinct…
Unofficially, it’s the Chicken From Hell
(Emma Schachner/University of Utah) – These shaded illustrations of some of the bones from the new dinosaur were drawn by Emma Schachner, a University of Utah postdoctoral fellow in biology. She is among four authors of a study of the bird-like, sharp-clawed, 11½-foot-long creature.
(Carnegie Museum of Natural History) – Stars on the map indicate sites in North and South Dakota where fossils were discovered. A study formally describing and naming the bird-like dinosaur is being published by researchers from the Carnegie Museum of Natural History, the Smithsonian’s National Museum of Natural History and the University of Utah.
It’s a big animal, the biggest oviraptorosaur species found in North America. The creature brings to mind a huge flightless bird, such as an ostrich or emu. The weird crest on its head, which resembles half a dinner plate turned vertically, looks like that of a cassowary. The new dinosaur is loaded with biological accessories and adaptations, as if evolution had been inspired by a Swiss Army knife.
“This group of dinosaurs looks really bizarre even by dinosaurian standards,” said Hans-Dieter Sues, another Smithsonian paleontologist and a co-author of the paper — “A New Large-Bodied Oviraptorosaurian Theropod Dinosaur From the Latest Cretaceous of Western North America” — published Wednesday in the journal PLOS One.
In the final line of “The Origin of Species,” Charles Darwin famously wrote of the “grandeur” of natural selection, through which “endless forms most beautiful and most wonderful have been, and are being, evolved” — but he never saw this animal from a Colonel Sanders nightmare.
The scientific name of the new species is Anzu wyliei — “Anzu” is from a mythological creature; “wyliei” is after the grandson of a patron of the Carnegie Museum of Natural History in Pittsburgh, which acquired the fossils and where the research has been conducted. Carnegie Museum paleontologist Matthew Lamanna, the lead author of the new study, and his colleagues spent close to a decade figuring out how the disarticulated bones of the three specimens fit together.
There aren’t many dinosaurs known from the end-Cretaceous period. This has led some scientists to argue that dinosaurs were petering out when the final whammy came in the form of a large asteroid that struck the Earth near the Yucatán peninsula.
But now comes Anzu, adding another genus to the dinosaur bestiary.
Anzu also reminds everyone of the birdiness of dinosaurs, and the dinosaur-ness of birds. Paleontologists can become dyspeptic when they hear that dinosaurs are extinct. Not so: Birds are dinosaurs.
Anzu is from the line of non-avian dinosaurs that went extinct at the end of the Cretaceous. Some of the birdiness of Anzu reflects “convergent” evolution, Lamanna said. Its ancestors had teeth, but it has none, meaning that the beak — a very birdy feature — evolved as an adaptation independently of the beak in the evolutionary line of true birds. That’s true also of the birdy crest on the head.
“It would have had a lot of birdy behaviors,” Lamanna said.
“When people think of a dinosaur, they think of something like a T. rex or a brontosaurus, and when they think of a bird, they think of something like a sparrow or a chicken. This animal, Anzu, has a mosaic of features of both of those groups, and so it basically provides a really nice link in the evolutionary chain.”
Nature likes birdiness, it appears.
Evolution has a sense of humor: Given enough time, and enough mutation, competition, selection pressure and hybridization, the forces of nature can turn a lizard into a Chicken From Hell.
Did it . . . cluck?