Ancient Birds Ready to Run after Egg Hatching
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Feathers revealed in a 125 million-year-old fossil of a bird hatchling shows it came out of the egg running.
Chickens and ducks are up and about within hours of hatching, they are “precocial” (Fig. 3). Pigeons and eagles are “altricial”, they stay in the nest and are looked after by their parents. How do you tell if a hatchling came “out of the egg running” or was “naked and helpless in the nest”? Feathers. When precocial birds hatch they have developed down feathers and partly developed large feathers and can keep warm and get around without mum’s help. “Previous studies searched for but failed to find any hints of feathers on the Los Hoyas hatchling. This meant that its original lifestyle was a mystery,” says Dr Pittman.
Credit: HKU e-learning
A bird hatchling leaving its nest shortly after birth ~125 million years ago. This baby bird lived in a lake environment and may have been born on the ground like some other extinct enantiornithine birds.
Image Credit: Julius T Csotonyi / HKU Vertebrate Palaeontology Laboratory.
Las Hoyas, Spain is known for spectacular fossils preserved in 126+ million-year-old rocks deposited in a lake environment.
Image Credit: HKU MOOC / HKU Vertebrate Palaeontology Laboratory.
This discovery via new technology demonstrates that some early birds adopted a precocial breeding strategy just like modern birds. Thus, in the time of the dinosaurs, some enantiornithine bird babies had the means to avoid the dangers of Mesozoic life perhaps by following their parents or moving around themselves. “One of the feathers discovered was of a substantial size and preserves features seen in other hatchlings. It indicates that our hatchling had reasonably well-developed flight feathers at the time of birth”, says Jesús Marugán-Lobón, a co-author from the Universidad Autónoma of Madrid, Spain (Figs. 2B, 4). This and other “illuminating” discoveries are adding to our knowledge of ancient life with details surviving in the fossil record that were never thought possible even a couple decades ago.
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University of Hong Kong
Citation: ‘Fully fledged enantiornithine hatchling revealed by Laser-Stimulated Fluorescence supports precocial nesting behavior’ by T. Kaye, M. Pittman, J. Marugán-Lobón , H. Martín Abad , J. Sanz & A. Buscalioni in Scientific Reports. http://www.nature.com/articles/s41598-019-41423-7
Source: http://www.ineffableisland.com/2019/03/ancient-birds-ready-to-run-after-egg.html
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