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migration

Comportement & Physiologie

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Comptonatus is an iguanodontid ornithopod dinosaur that lived about 125 million years ago, in the Early Cretaceous of what is now Europe. It was a medium sized herbivore at about 7 m in length, and weighed around 1 t in body mass. Fossilized footprints found near the original specimen indicate that Comptonatus was likely a herding animal. Comparisons between Comptonatus and other iguanodontids that lived around the same time and region show a high rate of diversity. This indicates there may have been pressure for speedy evolutionary adaptation in the region, or perhaps a high volume of migration.
Taxons Comptonatus

Comptonatus is an iguanodontid ornithopod dinosaur that lived about 125 million years ago, in the Early Cretaceous of what is now Europe. It was a medium sized herbivore at about 7 m in length, and weighed around 1 t in body mass. Fossilized footprints found near the original specimen indicate that Comptonatus was likely a herding animal. Comparisons between Comptonatus and other iguanodontids that lived around the same time and region show a high rate of diversity. This indicates there may have been pressure for speedy evolutionary adaptation in the region, or perhaps a high volume of migration.

migration Crétacé Crétacé inférieur spécimen +3
Identifier: ridpathshistoryo01ridp (find matches) Title: Ridpath's history of the world; being an account of the ethnic origin, primitive estate, early migrations, social conditions and present promise of the principal families of men .. Year: 1897 (1890s) Authors: Ridpath, John Clark, 1840-1900 Subjects: World history Ethnology Publisher: New York, Merrill & Baker Contributing Library: Mugar Memorial Library, Boston University Digitizing Sponsor: Boston University View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: the belief that the ap-pearance of man on the planet wouldoccur at the earliest practicable moment(so to speak), and that mankind wouldcontinue to nourish to the latest practi-cable date. It is one of the novel con- 82 GREAT RACES OF MANKIND. tradictions in the philosophy of a certainschool of thinkers that they would haveus believe that the earth, fitted up as itwere for the dwelling place of man, laygreen and virgin, waiting for his ap-pearance through eons of useless time—all this for no better reason than to sat-isfy the preconceptions of some impossi-ble system of chronology. Such short-sighted views of nature consistent with the astronomical andgeological preparation of the globe.Reason and fact alike require us to ac-cept as early a date for the appearanceof man as the design of the world andits conditions of habitability will admit.The results of reason must be acceptedin a world governed by law. That thedate of mans appearance was coinci-dent, or nearly coincident, with the Text Appearing After Image: .ANDSCAPE OF THE LOWER OOLITE (BEFORE THE AGE OF MAN).—Drawn by Riou. and of man we may at once dismiss asbelonging to the ignorance and blindnessRight reason de- of a former age. WhiledaTeforappS- the demands of right reason anceofman. ft0 not call for a limitless extension of man-life into the past, andwhile such a view is contradicted by sci-entific data which may not be doubted,a rational concept of the human race inrelation with the planetary life uponwhich it is maintained does call for aswide and far-reaching an arena as is astronomical changes in the characterof the earths orbit heretofore described,can not well be doubted by any onewhose mind has been freed from nar-row preconceptions on the subject.That our race career, measuring back-ward through the brief historical andtraditional periods of our ethnic life, hasextended far enough into the past tocover a considerable part of the planetlife with which it is associated, is a con-clusion warranted by every condition of TIME Note About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.

Identifier: ridpathshistoryo01ridp (find matches) Title: Ridpath's history of the world; being an account of the ethnic origin, primitive estate, early migrations, social conditions and present promise of the principal families of men .. Year: 1897 (1890s) Authors: Ridpath, John Clark, 1840-1900 Subjects: World history Ethnology Publisher: New York, Merrill & Baker Contributing Library: Mugar Memorial Library, Boston University Digitizing Sponsor: Boston University View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: the belief that the ap-pearance of man on the planet wouldoccur at the earliest practicable moment(so to speak), and that mankind wouldcontinue to nourish to the latest practi-cable date. It is one of the novel con- 82 GREAT RACES OF MANKIND. tradictions in the philosophy of a certainschool of thinkers that they would haveus believe that the earth, fitted up as itwere for the dwelling place of man, laygreen and virgin, waiting for his ap-pearance through eons of useless time—all this for no better reason than to sat-isfy the preconceptions of some impossi-ble system of chronology. Such short-sighted views of nature consistent with the astronomical andgeological preparation of the globe.Reason and fact alike require us to ac-cept as early a date for the appearanceof man as the design of the world andits conditions of habitability will admit.The results of reason must be acceptedin a world governed by law. That thedate of mans appearance was coinci-dent, or nearly coincident, with the Text Appearing After Image: .ANDSCAPE OF THE LOWER OOLITE (BEFORE THE AGE OF MAN).—Drawn by Riou. and of man we may at once dismiss asbelonging to the ignorance and blindnessRight reason de- of a former age. WhiledaTeforappS- the demands of right reason anceofman. ft0 not call for a limitless extension of man-life into the past, andwhile such a view is contradicted by sci-entific data which may not be doubted,a rational concept of the human race inrelation with the planetary life uponwhich it is maintained does call for aswide and far-reaching an arena as is astronomical changes in the characterof the earths orbit heretofore described,can not well be doubted by any onewhose mind has been freed from nar-row preconceptions on the subject.That our race career, measuring back-ward through the brief historical andtraditional periods of our ethnic life, hasextended far enough into the past tocover a considerable part of the planetlife with which it is associated, is a con-clusion warranted by every condition of TIME Note About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.

dent migration

Actualités

Avant le T. rex, il y avait le « prince dragon »
migration prédateur Dinosauria Khankhuuluu Tyrannosaurus découverte nouvelle espèce
Les scientifiques ont dévoilé Khankhuuluu, une nouvelle espèce de dinosaure mongol qui est antérieure et ressemble beaucoup aux premiers tyrannosaures. Avec son long museau, ses petites cornes et sa silhouette élancée, il représente une forme de transition entre les prédateurs rapides de taille moyenne et les chasseurs géants comme le T. rex. La découverte suggère également que les grands tyrannosaures ont évolué pour la première fois en Amérique du Nord à la suite d'une ancienne migration en provenance d'Asie.
24/10/2025 sciencedaily-human-evo ⚙ Traduction automatique
Des archéologues découvrent un pont terrestre perdu qui pourrait réécrire l'histoire de l'humanité
migration Turquie
New research along Turkey’s Ayvalık coast reveals a once-submerged land bridge that may have helped early humans cross from Anatolia into Europe. Les archéologues ont découvert 138 outils paléolithiques répartis sur 10 sites, ce qui indique que la région était un couloir de migration crucial pendant la période glaciaire. Les résultats remettent en question les théories traditionnelles de la migration centrées sur les Balkans et le Levant, suggérant plutôt que les humains ont emprunté des voies aujourd’hui disparues à travers la mer Égée.
12/10/2025 sciencedaily-human-evo ⚙ Traduction automatique
Qui sont les Papouasie-Néo-Guinéens ? Une nouvelle étude ADN révèle des origines étonnantes
ADN migration Guinée Papouasie-Nouvelle-Guinée génétique étude
Sur les îles isolées de Papouasie-Nouvelle-Guinée, les gens portent une histoire qui nous relie tous à nos racines les plus profondes. Bien que leur apparence frappante ait autrefois intrigué les scientifiques, de nouvelles preuves génétiques montrent qu'ils partagent une ascendance commune avec d'autres Asiatiques, façonnée par l'isolement, l'adaptation et même le métissage avec de mystérieux Dénisoviens. Pourtant, leur histoire unique – marquée par des problèmes de survie et une séparation des booms agricoles – laisse ouvertes des questions sur les premières migrations hors d’Afrique et sur leur origine.
15/09/2025 sciencedaily-human-evo ⚙ Traduction automatique
Qui étaient les humains mystérieux derrière les outils indonésiens vieux d’un million d’années ?
migration Indonésie fossile découverte évolution
Une découverte révolutionnaire sur l'île indonésienne de Sulawesi révèle que les premiers hominidés ont traversé des mers dangereuses il y a plus d'un million d'années, laissant derrière eux des outils en pierre qui remodèlent notre compréhension des migrations anciennes. Ces découvertes, plus anciennes que les preuves précédentes dans la région, mettent en évidence Sulawesi comme une pièce essentielle du puzzle de l’évolution humaine. Pourtant, l’absence de fossiles maintient l’identité de ces fabricants d’outils entourée de mystère, suscitant de nouvelles questions quant à savoir s’ils étaient des Homo avant.
10/09/2025 sciencedaily-human-evo ⚙ Traduction automatique
Le gène caché de Denisovan protège encore les humains aujourd'hui
ADN migration génétique
Les scientifiques ont découvert qu’un gène appelé MUC19, hérité des Dénisoviens lors de croisements anciens, pourrait avoir joué un rôle essentiel en aidant les ancêtres autochtones à s’adapter lors de leur migration vers les Amériques. Présent à des fréquences inhabituellement élevées dans les populations modernes et anciennes, le gène offrait probablement des avantages immunitaires contre les nouveaux agents pathogènes. Cette recherche met en évidence comment l'ADN archaïque, transmis à la fois aux Dénisoviens et aux Néandertaliens, a enrichi la diversité génétique humaine d'une manière qui reste encore présente.
24/08/2025 sciencedaily-human-evo ⚙ Traduction automatique
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