crownedrose: Birds Have Juvenile Dinosaur Skulls... - Wissenschaft und Deutsch
crownedrose:

Birds Have Juvenile Dinosaur SkullsBelow content via smithsonianmag.com

“Birds are dinosaurs. That much is certain. That deep connection, bolstered by fossil finds and theoretical frameworks, has made dinosaurs seem more bird-like than ever expected. From feathers to nesting behavior, many aspects of avian natural history are now known to have originated among non-avian dinosaurs.”
“Despite the fact that birds represent the only surviving dinosaurian lineage, though, their growth pattern is different. Instead of going through a period of protracted change, as with non-avian dinosaurs, the skulls of young birds are anatomically almost identical to those of adults. And birds take a much faster, more direct route to maturation—many bird species grow to adult size in a year or less. As a new Nature study by Bhart-Anjan Bhullar and collaborators suggests, this feature of bird life can be traced back to ancient transformations that effectively locked bird skulls into a permanent juvenile anatomy.”
“Bhullar and co-authors used a technique called geometric morphometrics to survey the degree of skull change among birds, various non-avian theropods, the archaic archosaur Euparkeria and the modern American alligator. By tracking landmarks on the skulls in virtual models, the researchers were able to quantify how much the skulls of particular creatures changed. As expected, most non-avian dinosaurs retained the ancestral growth pattern—juvenile skulls were significantly different from adult skulls, regardless of how big those dinosaurs were.”

Read the full article on smithsonianmag.com

crownedrose:

Birds Have Juvenile Dinosaur Skulls
Below content via smithsonianmag.com

“Birds are dinosaurs. That much is certain. That deep connection, bolstered by fossil finds and theoretical frameworks, has made dinosaurs seem more bird-like than ever expected. From feathers to nesting behavior, many aspects of avian natural history are now known to have originated among non-avian dinosaurs.”

“Despite the fact that birds represent the only surviving dinosaurian lineage, though, their growth pattern is different. Instead of going through a period of protracted change, as with non-avian dinosaurs, the skulls of young birds are anatomically almost identical to those of adults. And birds take a much faster, more direct route to maturation—many bird species grow to adult size in a year or less. As a new Nature study by Bhart-Anjan Bhullar and collaborators suggests, this feature of bird life can be traced back to ancient transformations that effectively locked bird skulls into a permanent juvenile anatomy.”

“Bhullar and co-authors used a technique called geometric morphometrics to survey the degree of skull change among birds, various non-avian theropods, the archaic archosaur Euparkeria and the modern American alligator. By tracking landmarks on the skulls in virtual models, the researchers were able to quantify how much the skulls of particular creatures changed. As expected, most non-avian dinosaurs retained the ancestral growth pattern—juvenile skulls were significantly different from adult skulls, regardless of how big those dinosaurs were.”

Read the full article on smithsonianmag.com

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    Birds Have Juvenile Dinosaur Skulls Archosaur skull changes (juveniles on the left, adults on the right). While there...
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