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The fossil record of early birds is very incomplete, because their bones are fragile and don't fossilize well. Since feathers don't fossilize very well either, no one really knows what these extinct birds looked like. Modern reconstructions are, therefore, based on educated guesses.
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Are pterosaurs related to dinosaurs?
Yes. Dinosaurs and pterosaurs were both archosaurs, a branch that also include crocodilians.
Were pterodactyls dinosurs?
Pterodactylus were pterosaurs, and although pterosaurs are often called "flying dinosaurs," they were not dinosaurs. Pterosaurs were flying reptiles that lived at the same time as dinosaurs, but they don't share the same common ancestor as dinosaurs and thus don't fall into the clade Dinosauria.
Was pterodactyl ancestor of birds?
No. Pterosaurs share a common ancestor with the dinosaurs, but are not classed as dinosaurs themselves. Birds, however, descend from a group of dinosaurs called theropods; the earliest bird know, Archaeopteryx, dates to about 150 million years ago. The theropods also include dinosaurs such as T. rex, velociraptors, and other bird-like dinosaurs.
Is the Crocodile really a descendant of the dinosaur?
Crocodilians are distantly related to the dinosaurs in that they are both Archosaurs, but the former definitely are not descended from the Dinosaurs. They are both members of what is known as a ''crown group'' (the Archosauria). This refers back to a long-extinct bevy of Reptiles that includes the common ancestor of the two living archosaurs -- crocodilians and birds -- and the extinct avian and non-avian dinosaurs. In short, they are related only in that they (crocodilians and dinosaurs) both evolved from the same ancestral reptile.
How were pterodactyls differant from most dinosaurs?
Pterodactylus and other flying reptiles, collectively known as pterosaurs, do not belong to the clade Dinosauria, and thus aren't dinosaurs. This is because they did not evolve from the common ancestor of all dinosaurs. All dinosaurs were terrestrial animals, and with the exception of birds, they couldn't fly. All pterosaurs were winged quadrupeds, and at least most of them were capable of flight.
What is the common Ancestor of the horse and zebra and ass?
The common ancestor is the Hyracotherium
Is a hippo an ancestor of the whale?
No..But they may have had a common ancestor.
Do seals and humans share a common ancestor?
yes they do in facts share a common ancestor.
What was the common ancestor between elephants and sirenians?
The common ancestor between elephants and sirenians is Manatee.
Who was the common ancestor of Christianity?
The common ancestor of the three religions Judaism, Christianity and Islam was Abraham
What does it mean when two species share a common ancestor?
An ancestor.
What do protists lack what probably makes them so diverse?
a common ancestorA common ancestor is what protest lack. This is what makes them so diverse.
