Sentences with phrase «when early mammal»

The addition of the fossil to existing data on ancient turtles solidifies the theory that changes to the ribs and vertebrae were early steps in shell evolution and occurred during the Permian geological period, when early mammal, bird, and crocodile relatives were also diversifying.

The researchers focused on the Southern End of the world from about 252 million to 199 million years ago during the Triassic period when the earliest mammals and reptiles lived on Pangea.

Not exact matches

«Among marine mammals, when a slow - swimming animal is living close to the sea floor, generally the bone is much more compact, and this is something we want to test with these early mysticetes.»

The fossil, taken from amber mines in Myanmar, dates 97 - 110 million years ago to the early - to - mid Cretaceous, when the land was still dominated by dinosaurs and conifers, but the earliest flowering plants, grasses and small mammals were beginning to evolve.

A variety of mammals spend far more time in REM sleep during early life than when they are adults.

Some suggest that rabbit - or ungulate - like placental mammals existed early in the Cretaceous period, whereas other researchers push for a more recent origin, circa 65 million years ago — around the time when dinosaurs disappeared.

To try to pin an age on these fossil genes and determine when these ancient infections happened, Taylor and his co-authors — virologist Jeremy Bruenn, and bioinformatics specialist Robert Leach, both also of SUNY Buffalo — compared the viral remnants in different species and found they were nearly identical, indicating that they infected mammals only once early in evolution, and then the viral remnants were passed down as the groups diverged.

When the breed was first created in the early 17th century, hunters were attempting to create a fearless, elongated dog that could dig its way into a badger's hole and do battle with the tenacious little mammals.

When it seemed the creature had become a reliable fixture at the Fort Bragg marina, the marine mammal center launched an attempted rescue that brought a full team together for two days at Noyo Harbor in early June.

Earlier this year, it received the recognition it deserved when it won the Academy Award for best documentary.SLIDESHOW: Dolphins, Magnificent Mammals

Movement analysis of one satellite - tracked killer whale travelling as part of a group of 20 + killer whales showed that the whale remained in Prince Regent Inlet and in the northern part of the Gulf of Boothia from late August until early October, when locations overlapped aggregations of marine mammal prey species, including seals, narwhal, and bowhead whales (Matthews et al. 2011).

It is perhaps the world's richest trove of rocks from the late Triassic, when dinosaurs, and early mammals, got their evolutionary start.