Sentences with phrase «in modern mammals»

«Megaconus shows that many adaptations found in modern mammals were already tried by our distant, extinct relatives.

Seasonal shut - down Although LAGs have been found in mammalian bones before, Köhler notes, this is the most comprehensive study of the structures in modern mammals across a range of latitudes.

Plus, he notes, Spinolestes has all the hair categories seen in modern mammals «and that's not a small thing.»

Two cops discover a conspiracy in their modern mammal metropolis in the first trailer for Zootopia, hitting theaters spring 2016

Not exact matches

«In its 4.6 billion years circling the sun, the Earth has harbored an increasing diversity of life forms: for the last 3.6 billion years, simple cells (prokaryotes); for the last 3.4 billion years, cyanobacteria performing ph - otosynthesis; for the last 2 billion years, complex cells (eukaryotes); for the last 1 billion years, multicellular life; for the last 600 million years, simple animals; for the last 550 million years, bilaterians, animals with a front and a back; for the last 500 million years, fish and proto - amphibians; for the last 475 million years, land plants; for the last 400 million years, insects and seeds; for the last 360 million years, amphibians; for the last 300 million years, reptiles; for the last 200 million years, mammals; for the last 150 million years, birds; for the last 130 million years, flowers; for the last 60 million years, the primates, for the last 20 million years, the family H - ominidae (great apes); for the last 2.5 million years, the genus H - omo (human predecessors); for the last 200,000 years, anatomically modern humans.»

Other indications of evolution are too numerous to actually list in full, but a few might be the clear genetic distinction between Neanderthals and modern man; the overlapping features of hominid and pre-hominid fossil forms; the progressive order of the fossil record (that is, first fish, then amphibians, then reptiles, then mammals, then birds; contradicting the Genesis order and all flood models); the phylogenetic relationships between extant and extinct species (including distributions of parasitic genetic elements like Endogenous Retroviruses); the real time observations of speciation in the lab and in the wild; the real time observations of novel functionality in the lab and wild (both genetic, Lenski's E. coli, and organsimal, the Pod Mrcaru lizards); the observation of convergent evolution defeating arguments of common component creationism (new world v. old world vultures for instance); and... well... I guess you get the picture.

In a paper published in the journal Systematic Biology and delivered at the Society for Molecular Biology and Evolution Conference this week, Dr Phillips said biases in models of DNA evolution inflated estimates of when modern mammals, which were once no larger than a guinea pig, diversified and evolved into the animals familiar to us todaIn a paper published in the journal Systematic Biology and delivered at the Society for Molecular Biology and Evolution Conference this week, Dr Phillips said biases in models of DNA evolution inflated estimates of when modern mammals, which were once no larger than a guinea pig, diversified and evolved into the animals familiar to us todain the journal Systematic Biology and delivered at the Society for Molecular Biology and Evolution Conference this week, Dr Phillips said biases in models of DNA evolution inflated estimates of when modern mammals, which were once no larger than a guinea pig, diversified and evolved into the animals familiar to us todain models of DNA evolution inflated estimates of when modern mammals, which were once no larger than a guinea pig, diversified and evolved into the animals familiar to us today.

«In particular, we found a group called Laurasiatheria quickly increased their body size and ecological diversity, setting them on a path that would result in a modern group containing mammals as diverse as bats, cats, rhinos, whales, cows, pangolins, shrews and hedgehogs.&raquIn particular, we found a group called Laurasiatheria quickly increased their body size and ecological diversity, setting them on a path that would result in a modern group containing mammals as diverse as bats, cats, rhinos, whales, cows, pangolins, shrews and hedgehogs.&raquin a modern group containing mammals as diverse as bats, cats, rhinos, whales, cows, pangolins, shrews and hedgehogs.»

Now, a new analysis using the same sort of computer software that engineers employ to analyze bridges and aircraft parts suggests that Kolponomos may have collected its shelly prey in a unique way: They might have used their teeth and formidable neck muscles to clamp down on clams, mussels, and other mollusks and then wrench them directly off the rocks to which they were attached, the researchers report online today in the Proceedings of the Royal Society B. (Modern marine mammals that consume such prey either slurp them right out of the shell, as walruses do, or pry them from the rocks using their forelimbs and then eat them, as otters do.)

The principles of infectious disease are the same as they have always been, but modern conditions, including life in proximity to pets and mammal - filled woods, are exposing us to new pathogen reservoirs and new modes of transmitting disease.

In fact, Martin argues that «the evolutionary paths taken by most modern animals, whether these are crocodilians, turtles, birds, lungfish, amphibians, earthworms, insects, crustaceans, or mammals, are connected to their burrowing ancestors.»

Small mammals and reptiles can be very diverse and abundant in modern ecosystems, but small dinosaurs (less than 100 kg) are considerably less common than large ones in the fossil record.

With modern advances in DNA sequencing technology, detecting the presence of forest mammals based on DNA detection in the guts of invertebrates has become a potential approach to study the diversity of forest mammals.

So it's possible that these early relatives of modern mammals evolved in cooler, upland areas and that the dinosaurs were in the hotter, lowland areas.

«We discovered this new fossil in marine rocks, and many of the features of its skull and jaws point to it having been a marine inhabitant, like modern oceanic dolphins,» said the study's lead author Nicholas D. Pyenson, curator of fossil marine mammals at the Smithsonian's National Museum of Natural History.

The classic story is that all modern mammal groups started to develop no more than 65 million years ago, after the end of the Cretaceous Period, when a probable meteorite impact led to a major extinction in which all the dinosaurs died.

There have been suggestions that modern mammals and birds evolved in upland areas, cooler areas, and that's why birds and mammals developed control of their body temperatures.

Ophiacodon probably isn't directly ancestral to modern mammals, and its «warm - blooded» characters show that it may have evolved it in parallel with mammals, which itself is interesting.

They also used the conservation status of modern mammals to model diversity and body size distributions for 200 years in the future.

Hosts infected by viruses found new uses for the genetic material the agents of disease left behind; metabolic enzymes somehow came to refract light rays through the eye's lens; mammals took advantage of the sutures between the skull bones to help their young pass through the birth canal; and, in the signature example, feathers appeared in fossils before the ancestors of modern birds took to the skies.

Now Zhe - Xi Luo of the Carnegie Museum of Natural History in Pittsburgh and his colleagues have found one: Yanoconodon allini, an intermediate between modern mammals and their distant ancestors.

In spite of their size, these big mammals were extremely vulnerable, as are modern elephants.

Regardless, it represents a key middle step in evolving the exquisitely sensitive modern mammal ear.

Dunne continued: «We now know that the rainiforest collapse was crucial in paving the way for amniotes, the group which ultimately gave rise to modern mammals, reptiles and birds, to become the dominant group of land vertebrates during the Permian period and beyond.»

One hypothesis suggests that Neandertals were rigid in their dietary choice, targeting large herbivorous mammals, such as horse, bison and mammoths, while modern humans also exploited a wider diversity of dietary resources, including fish.

Modern conservation efforts tend to center around large animals — such as tigers, elephants, and wolves — and top predators in peril, while Roopnarine and Angielczyk show that small amniotes (reptiles and ancient mammal relatives) were most vulnerable during the early phase of this long - ago period of extinction.

With colleagues, he used common features in the genomes of 36 modern mammals to sketch out the genome of the creature from which they descended.

A new genetic analysis suggests that the common ancestor of modern mammals may not have been shrewlike in size, but more like a small monkey

The authors suspect that the presence of big teeth in fossil sperm whales may suggest that they were feeding on large prey, perhaps marine mammals such as seals and other smaller whales as opposed to modern sperm whales, which feed primarily on squid, hardly using their teeth for chewing.

What's more, the new tree indicates that these mammals very quickly diversified into the modern groups, close to the downfall of the dinosaurs, Wible and colleagues report in the 21 June issue of Nature.

The species name xenarthrosus refers to the odd way the creature's spinal vertebrae interlock and stiffen the back, similar to modern - day armadillos, anteaters, and other mammals in a group called xenarthrans.

«At the same time as this eclectic mix of ancient and modern - type marine mammals was living together, the marine mammal fauna in the North Atlantic and Southern Ocean were already in the forms we find today.»

Conventional wisdom holds that the precursors of modern placental and marsupial mammals arose toward the end of the Jurassic in the Northern Hemisphere, based on the ages and locations of the earliest remains of these shrewlike creatures, which are characterized by so - called tribosphenic molars.

We argue that these morphogenetic mechanisms of modern mammals were operating before the rise of modern mammals, driving the morphological disparity in the earliest mammaliaform diversification.

These adaptations may have played an important role in the later success of modern mammals once the dinosaurs went extinct about 66 million years ago, says Richard Cifelli, a vertebrate paleontologist at the University of Oklahoma, Norman, who was not involved with the work.

Inspired by the success of his experiments with modern mammals, Hillenius decided to do a systematic search for turbinal ridges in the fossil skulls of mammallike reptiles.

In this first example of that phenomenon in birds and nematodes, we learned that a class of parasites that is a present - day scourge once switched hosts from birds to mammals — a process that is all too familiar to modern epidemiologistIn this first example of that phenomenon in birds and nematodes, we learned that a class of parasites that is a present - day scourge once switched hosts from birds to mammals — a process that is all too familiar to modern epidemiologistin birds and nematodes, we learned that a class of parasites that is a present - day scourge once switched hosts from birds to mammals — a process that is all too familiar to modern epidemiologists.

The team discovered that the genes responsible for the regulation of NRL became more refined in the placental mammals as the modern retina evolved and were lost in several non-mammalian groups.

Vertebrate animals also made their first appearance in the Cambrian Explosion, the distant ancestors of modern fish, reptiles, birds and mammals.

Then there are the almost countless fish, some with the tail of a smaller fish grotesquely hanging out of their mouths.These fossils offer more than beauty: they preserve in wonderful detail early forms of modern birds and mammals, including the first bats in the fossil record, making them vital windows into evolution.

As no other taxonomic group contains terrestrial animals in the size classes of the large modern mammals, the functional loss of large mammals can rarely be compensated, leading to permanent ecosystem changes [49].

In order to reinforce their results, the scientists compared their data with more than 200 bones from modern mammals, whose diet is known, as well as with fossil specimens from both carnivores and herbivores.

Discovered in Inner Mongolia, China, Megaconus is one of the best - preserved fossils of the mammaliaform groups, which are long - extinct relatives to modern mammals.

«Megaconus confirms that many modern mammalian biological functions related to skin and integument had already evolved before the rise of modern mammals,» said Luo, who was also part of the team that first discovered evidence of hair in pre-mammalian species in 2006 (Science, 331: 1123 - 1127, DOI: 10.1126 / science.1123026).

This gap in knowledge led to a debate over the shape of the mammalian evolutionary tree: Did haramiyids belong on the crown mammal branch, from which all modern mammals descend, suggesting that mammals began to diversify more than 210 million years ago in the Triassic?

Applying these strictures to modern animals is fairly straightforward, since these two characteristics are restricted only to members of the clade Ruminantia, which is the subgroup of even - toed hoofed mammals that includes the cattle, goats, sheep, antelopes, deer, pronghorn, mouse deer, giraffe (Zivotofsky 2000) and okapi (a clade is a taxonomic group whose members share a common ancestry; in this case it does not have a formal associated Linnaean level, such as family or order).

Therefore, the cold - weather characteristics seen in modern Yakutian horses represents one of the fastest examples of adaptation within mammals.

«Conclusion: As physical activity expenditure has not declined over the same period that obesity rates have increased dramatically, and daily energy expenditure of modern man is in line with energy expenditure in wild mammals, it is unlikely that decreased expenditure has fuelled the obesity epidemic.»

Immerse yourself in modern luxury at Dolphinaris Park Riviera Maya, the only interactive dolphin park in the world where you'll get to know these fun - loving mammals throughout and enrichment half day experience in a dramatic setting with towering palapas, swaying palm trees and warm tropical style.

In most modern countries these mammals are protected but sadly we see these exceptions.