Paleontologists regard this modification as the defining characteristic of mammalian fossils.

Paleontologists recognize only the type species, G. libratus, although other species have been erroneously referred to the genus.

Paleontologists once thought that Carcharodontosaurus had the longest skull of any of the theropod dinosaurs.

Paleontologists examine the fossil record in order to understand the process of evolution and the way particular species have evolved.

Paleontologists have defined no faunal stages for the Holocene.

Paleontologists that have worked in this area include J. David Archibald, Alexander Averianov, Sergei Kurzanov, Lev Nesov, Anatoly Riabinin, Anatoly Rozhdestvensky, and Hans-Dieter Sues.

Paleontologists investigating dinosaur ontogeny ( growth and development of individuals over the life span ) in the Hell Creek Formation of Montana, have recently presented evidence that the two actually represent a single genus.

Paleontologists David M. Raup and Jack Sepkoski have proposed that an excess of extinction events occurs roughly every 26 million years ( though many are relatively minor ).

Paleontologists doubt adult cave bears had any natural predators, save for pack-hunting wolves and cave hyenas, which would probably have attacked sick or infirm specimens.

Paleontologists initially classified Kimberella as a type of jellyfish, but since 1997 features of its anatomy and its association with scratch marks resembling those made by a radula have been interpreted as signs that it may have been a mollusc.

Paleontologists are researching new methods of identifying gastroliths that have been found disassociated from animal remains, because of the important information they can provide.

Paleontologists suggest that its giant size was an adaptation for life in the murky bottom waters, where a correspondingly large gill area would have allowed the animal to cope with oxygen-depleted waters.

Paleontologists have proposed many ways in which the sail could have functioned in life.

Paleontologists have found two well-preserved fossils, one in Germany in the 1850s and the second in France more than a century later.

Paleontologists have observed that Torosaurus specimens are relatively uncommon in the fossil record ; specimens of Triceratops are more abundant.

Paleontologists investigating dinosaur ontogeny ( growth and development of individuals over the life span ) in the Hell Creek Formation of Montana, have hypothesized that Triceratops and Torosaurus may be growth stages in a single genus.

Paleontologists have estimated full-grown adults to weigh more than.

Paleontologists have been unearthing and studying the fossils in the region since 1864, when Thomas Condon, a missionary and amateur geologist, recognized their importance and made them known globally.

Paleontologists have found a hadrosaurid leg bone in Paleocene rocks, but it was probably reworked from a Cretaceous source.

* Paleontologists have announced the discovery of fossil records near Barcelona of an ape species which is believed to be the common ancestor of all apes.

Paleontologists of the Science Museum of Minnesota have studied the site for nearly thirty years.

Paleontologists in India have recently identified grass phytoliths in dinosaur dung ( coprolites ), strongly suggesting that the evolution of grasses began earlier than previously thought.

Paleontologists such as Carpetner ( 1997 ) have contended that the rounded dome of Stegoceras would have given a very small area for potential impact.

Society of Economic Paleontologists and Mineralogists, Special Publication No. 54, p. 95 – 126.

Paleontologists Paul Sereno of the University of Chicago, Jeff Wilson of the University of Michigan, and Srivastava worked together as an Indo – American group to study the Narmada River fossils.

Paleontologists involved in the research hope to find further fossils in the area.

Paleontologists also find the Tethys Ocean particularly important because much of the world's sea shelves were found around its margins for such an extensive length.

Paleontologists divide more than 80 genera of ground sloths in multiple families.

Paleontologists supervise and direct the work of volunteers.

Paleontologists suggest that it is representative of the transition between non-tetrapod vertebrates such as Panderichthys, known from fossils 380 million years old, and early tetrapods such as Acanthostega and Ichthyostega, known from fossils about 365 million years old.

Paleontologists concluded that " the change happened gradually, in a way consistent with evolution via natural selection — not suddenly, as researchers once had little choice but to believe.

Paleontologists were called in to carefully remove and preserve the bones, and construction restarted within four days.

Most paleontologists regard birds as the only surviving dinosaurs ( see Origin of birds ).

Chipmunks play an important role as prey for various predatory mammals and birds, but are also opportunistic predators themselves, particularly with regard to bird eggs and nestlings.

Due to their obstinate personality traits Cherry-Garrard held the birds in great regard, “ Whatever Adélie penguin does has individuality, and he lays bare his whole life for all to see.

2011-The Wildlife and Natural Environment ( Scotland ) Act 2011 made some major amendments with regard to control of non-native species, the protection of birds, protection of hares and rabbits and associated poaching.

Experts regard it as one of the most intelligent birds in the world.

With regard to birds, the most common species found in the oblast are black cocks, hazel grouses, quails, snipes, woodpeckers, wood grouses, and other.

With regard to " face specific " effects in neuroimaging, there are now multiple replications with Greebles, with birds and cars, and two unpublished studies with chess experts.

In this paper, Clarke discussed frequency-dependent selection particularly with regard to predator attacks on polymorphic British snails, citing Luuk Tinbergen's classic work on searching images as support that predators such as birds would tend to specialize on common forms of palatable species.

The taxonomy of Protoavis is controversial, with several palaeornithologists considering it to be an early ancestor of modern birds, while most other in the palaeontological community regard it as a chimaera, a mixture of several specimens.

Territorial birds, saddlebacks display antagonistic behaviour in this regard on three levels of intensity, singing out at dawn to mark their territory, making threat displays, which can include head bobbing, tail fanning, and warbling displays ( at the same time the wattles become dilated ), and finally, when a direct challenge is made to a bird's territory, fights can occur in which combatants attempt to grapple with the wattles of their foe.