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Pterodactyls could fly from birth.
#1
Baby pterodactyls could fly from birth

by University of Leicester

[Image: 5d00cb4fec2d4.jpg]
Credit: James Brown

A breakthrough discovery reveals that pterodactyls, extinct flying reptiles, had a remarkable ability—they could fly from birth. The importance of this discovery is highlighted by the fact that no other living vertebrates today, or those in the history of the fossil record, had this ability. This revelation has a profound impact on our understanding of how pterodactyls lived, which is critical to understanding how the dinosaur world worked as a whole.
Previously, pterodactyls were thought only to be able to take to the air once they had grown to nearly full size, like birds or bats. This assumption was based on fossilized embryos of the creatures found in China that had poorly developed wings.
However, Dr. David Unwin, a University of Leicester palaeobiologist who specialises in the study of pterodactyls, and Dr. Charles Deeming, a University of Lincoln zoologist who researches avian and reptilian reproduction, have disproved this hypothesis. They compared these embryos with data on prenatal growth in birds and crocodiles, finding that they were still at an early stage of development and a long way from hatching. The discovery of more advanced embryos in China and Argentina that died just before they hatched provided the evidence that pterodactyls had the ability to fly from birth.
Dr. David Unwin said, "Theoretically, what pterosaurs did, growing and flying, is impossible, but they didn't know this, so they did it anyway."
Another fundamental difference between baby pterodactyls, also known as flaplings, and baby birds or bats, is that they had no parental care and had to feed and look after themselves from birth. Their ability to fly gave them a lifesaving survival mechanism which they used to evade carnivorous dinosaurs. This ability also proved to be one of their biggest killers, as the demanding and dangerous process of flight led to many of them dying at a very early age.
The research has also challenged the current view that pterodactyls behaved in a similar way to birds and bats and has provided possible answers to some key questions surrounding these animals. Since flaplings were able to both fly and grow from birth, this provides a possible explanation as to why they were able to reach enormous wingspans, far larger than any historic or current species of bird or bat. How they were able to carry out this process will require further research, but it is a question that wouldn't have been posed without these recent developments in our understanding.
Dr. Deeming added: "Our technique shows that pterosaurs were different from birds and bats and so comparative anatomy can reveal novel developmental modes in extinct species."

https://phys.org/news/2019-06-baby-ptero...birth.html



Journal Reference:
David Michael Unwin et al. Prenatal development in pterosaurs and its implications for their postnatal locomotory ability, Proceedings of the Royal Society B: Biological Sciences (2019). DOI: 10.1098/rspb.2019.0409

Abstract
Recent fossil finds in China and Argentina have provided startling new insights into the reproductive biology and embryology of pterosaurs, Mesozoic flying reptiles. Nineteen embryos distributed among four species representing three distinct clades have been described and all are assumed to be at, or near, term. We show here how the application of four contrasting quantitative approaches allows a more precise identification of the developmental status of embryos revealing, for the first time to our knowledge, the presence of middle and late developmental stages as well as individuals that were at term. We also identify a predicted relationship between egg size and shape and the developmental stage of embryos contained within. Small elongate eggs contain embryos at an earlier stage of development than larger rounder eggs which contain more fully developed embryos. Changes in egg shape and size probably reflect the uptake of water, consistent with a pliable shell reported for several pterosaurs. Early ossification of the vertebral column, limb girdles and principal limb bones involved some heterochronic shifts in appearance times, most notably of manus digit IV, and facilitated full development of the flight apparatus prior to hatching. This is consistent with a super-precocial flight ability and, while not excluding the possibility of parental care in pterosaurs, suggests that it was not an absolute requirement.


Footnotes
Electronic supplementary material is available online at https://dx.doi.org/10.6084/m9.figshare.c.4521782.

https://royalsocietypublishing.org/doi/1....2019.0409
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  • Claudiu Constantin Nicolaescu, Lightning, Verdugo
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#2
That's awesome. Can any species of bird do this?
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