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27 septembre 2017

How did dinosaurs evolve beaks and become birds ? Scientists think they have the answer [Phys]

Once you know that many dinosaurs had feathers, it seems much more obvious that they probably evolved into birds. But there’s still a big question. How did a set of dinosaurian jaws with abundant teeth (think T. rex) turn into the toothless jaws of modern birds, covered by a beak ? Two things had to happen in this transition, suppression of the teeth and growth of the beak. Now new fossil evidence has shown how it happened.

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27 septembre 2017

Ecology : A global plan for nature conservation [Nature - News & Views]

An international movement is calling for at least half of the Earth to be allocated for conservation. A global study now reveals that, in many ecoregions, enough habitat exists to reach this goal, and ideas are proposed for the next steps needed.

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27 septembre 2017

Voyage ornithologique au Sri Lanka [Ornithomedia]

Plusieurs observateurs australiens ont séjourné dans le sud-ouest de cette île et ils ont observé toutes les espèces d’oiseaux endémiques.

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27 septembre 2017

Climate change made Lucifer heatwave far more likely, scientists find [The Guardian]

Without action to tackle global warming, deadly summer temperatures of 40C in Europe could be normal by 2050.

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27 septembre 2017

Descendons-nous du chimpanzé ? : la biologie évolutive et ses idées reçues [The Conversation]

« Rien en biologie n’a de sens, si ce n’est à la lumière de l’évolution » disait le biologiste Theodosius Dobjansky. Malgré l’importance qu’occupe l’évolution en sciences, celle-ci demeure l’une des théories scientifiques les plus incomprises.

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