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Description
Avisaurus archibaldi
Named by Michalael K. Brett-Surman and Gregory S. Paul, 1985
Diet: Carnivore (Prey included small animals such as small mammals, lizards, etc.)
Type: Avialae Euavialae Avebricaudia Pygostylia Ornithothoraces (Avisaurid Enantiornithine) theropod dinosaur
Size: 1.5 feet (45 centimeters) long and 200g (Note: The size is just estimated as it was known from mostly scant remains)
Region: North America (Montana and Dakotas USA)
Age: Late Cretaceous (68 to 66 million BC; Late Maastrichtian)
Enemies: Ground-dwelling theropod dinosaurs such as Tyrannosaurus rex, Acheroraptor, and Dakotaraptor, as well as crocodylimorphs such as Borealosuchus and Brachychampsa
Episode: Walking with Dinosaurs wonderbook videogame (as Alexornis)
Info: Living in what is now western North America during the last days of the Cretaceous period (Late Maastrichtian stage), Avisaurus was one of the last of a diverse group of Cretaceous toothed birds known as the enantiornithines before sharing the same fate with their dinosaur relatives and 75% of all plant and animal types in the infamous Cretaceous-Paleogene (K-Pg) Mass Extinction event, 66 million years ago. As the recently-discovered Mirarce (found in Campanian age rocks in Utah) show that they were just as well adapted to flight as modern birds, it is unknown as to why Avisaurus and the other enantiornithines did not make it through the extinction event as none of their fossil remains were found above the K-Pg boundary rock layer, whereas the neornthines or aves, the crown group in which all of over ten thousand living species of birds belong to and the only living lineage of the dinosauria clade, survived the event and went into an explosive radiation in the aftermath (Paleocene epoch of the Early Paleogene period).

Note: Based on the recently updated version by while is sorta based on bald eagle, but with white belly as its believed that this toothed bird would've been like the raptors or bird of prey.

Whereas many of the archaic birds like Avisaurus did not make it through 66 million BC and shared the same fate with their dinosaur relatives (such as Tyrannosaurus rex, Triceratops prorsus, Edmontosaurus annectens, Ankylosaurus, Pachycephalosaurus, Dakotaraptor, Alamosaurus, etc.), the dinosauria clade survived with the neornithine/aves or modern birds and in the wake of the infamous K-Pg event, they went into an explosive radiation, giving rise to many different types and families. Today there are over ten thousand species of birds and so the dinosaurs are still thriving and diversifying(www.youtube.com/watch?v=3bDK1d… and www.youtube.com/watch?v=EFkc3Y… ).

Requested by

Walking with Dinosaurs is owned by BBC

Description
Avisaurus archibaldi
Named by Michalael K. Brett-Surman and Gregory S. Paul, 1985
Diet: Carnivore (Prey included small animals such as small mammals, lizards, etc.)
Type: Avialae Euavialae Avebricaudia Pygostylia Ornithothoraces (Avisaurid Enantiornithine) theropod dinosaur
Size: 1.5 feet (45 centimeters) long and 200g (Note: The size is just estimated as it was known from mostly scant remains)
Region: North America (Montana and Dakotas USA)
Age: Late Cretaceous (68 to 66 million BC; Late Maastrichtian)
Enemies: Ground-dwelling theropod dinosaurs such as Tyrannosaurus rex, Acheroraptor, and Dakotaraptor, as well as crocodylimorphs such as Borealosuchus and Brachychampsa
Episode: Walking with Dinosaurs wonderbook videogame (as Alexornis)
Info: Living in what is now western North America during the last days of the Cretaceous period (Late Maastrichtian stage), Avisaurus was one of the last of a diverse group of Cretaceous toothed birds known as the enantiornithines before sharing the same fate with their dinosaur relatives and 75% of all plant and animal types in the infamous Cretaceous-Paleogene (K-Pg) Mass Extinction event, 66 million years ago. As the recently-discovered Mirarce (found in Campanian age rocks in Utah) show that they were just as well adapted to flight as modern birds, it is unknown as to why Avisaurus and the other enantiornithines did not make it through the extinction event as none of their fossil remains were found above the K-Pg boundary rock layer, whereas the neornthines or aves, the crown group in which all of over ten thousand living species of birds belong to and the only living lineage of the dinosauria clade, survived the event and went into an explosive radiation in the aftermath (Paleocene epoch of the Early Paleogene period).

Note: Based on the recently updated version by while is sorta based on bald eagle, but with white belly as its believed that this toothed bird would've been like the raptors or bird of prey.

Whereas many of the archaic birds like Avisaurus did not make it through 66 million BC and shared the same fate with their dinosaur relatives (such as Tyrannosaurus rex, Triceratops prorsus, Edmontosaurus annectens, Ankylosaurus, Pachycephalosaurus, Dakotaraptor, Alamosaurus, etc.), the dinosauria clade survived with the neornithine/aves or modern birds and in the wake of the infamous K-Pg event, they went into an explosive radiation, giving rise to many different types and families. Today there are over ten thousand species of birds and so the dinosaurs are still thriving and diversifying(www.youtube.com/watch?v=3bDK1d… and www.youtube.com/watch?v=EFkc3Y… ).

Requested by

Walking with Dinosaurs is owned by BBC