Who are believed to be the direct ancestors to birds?
singleAnswer
dinosaurs Archaeopteryx archosaurian reptiles extinct non-avian dinosaurs Archaeopteryx lithographica
The Origin of Birds Origin of birds
direct ancestors to birds
Origin of birds Evolution of birds The Origin of Birds List of transitional fossils Pterosaur Evolution of mammals Proavis Evolution of dinosaurs Bird Timeline of human evolution
The scientific question of within which larger group of animals <b>birds</b> evolved, has 
traditionally ... He was therefore forced to rule out dinosaurs as <b>bird ancestors</b> 
and ascribe all of their similarities to convergent evolution. Heilmann stated that&nbsp;... The evolution of <b>birds</b> began in the Jurassic Period, with the earliest <b>birds</b> derived 
from a clade ... Though it is not considered a <b>direct ancestor</b> of modern <b>birds</b>, it 
gives a fair representation of how flight evolved and how the very first <b>bird</b> might&nbsp;... The Origin of <b>Birds</b> is an early synopsis of <b>bird</b> evolution written in 1926 by 
Gerhard Heilmann, ... to Archaeopteryx and modern <b>birds</b>, he determined that 
they were unlikely to be <b>direct bird ancestors</b> and that they were instead closely–
related&nbsp;... This is a tentative partial list of transitional fossils The fossils are listed in series, 
showing the ... dinosaurs and <b>birds</b>, but it is not the most recent common <b>ancestor</b> 
of all <b>birds</b> nor is it a <b>direct ancestor</b> of any species of <b>bird</b> alive today. Rather&nbsp;... Pterosaurs were flying reptiles of the extinct clade or order Pterosauria. They 
existed during ... Earlier, the evolutionist St. George Jackson Mivart had 
suggested pterosaurs were the <b>direct ancestors</b> of <b>birds</b>. Owen opposed the 
views of both&nbsp;... The evolution of mammals has passed through many stages since the first 
appearance of their synapsid <b>ancestors</b> in the Pennsylvanian sub-period of the 
late Carboniferous period. ... The sauropsids are today&#39;s reptiles and <b>birds</b> along 
with all the extinct animals more closely related to them than to mammals. This 
does not&nbsp;... Proavis refers to a hypothetical extinct species or hypothetical extinct taxon and 
was coined in ... In his view the <b>direct ancestors</b> of <b>birds</b> cannot have been 
completely arboreal, because in that case they would probably have used 
membranes&nbsp;... Dinosaurs evolved within a single lineage of archosaurs 243-233 Ma (million 
years ago) from ... Dinosaurs can be defined as the last common <b>ancestor</b> of 
<b>birds</b> (Saurischia) and Triceratops (Ornithischia) and all the <b>descendants</b> of that&nbsp;... <b>Birds</b> are a group of warm-blooded vertebrates constituting the class Aves, 
characterized by ... feathers similar to those of modern <b>birds</b>. It is not considered a 
<b>direct ancestor</b> of <b>birds</b>, though it is possibly closely related to the true <b>ancestor</b>. The timeline of human evolution outlines the major events in the evolutionary 
lineage of the ... Because they are the simplest animals to possess them, their 
<b>direct ancestors</b> were very probably the first animals to use nerves and muscles 
together. ... It is used in the claws of modern lizards and <b>birds</b>, and hair in 
mammals.
theropod dinosaurs
Origin of birds