2013年3月6日 · Ambulocetus natans, which lived 49 million years ago, was a semiaquatic whale - an evolutionary step from land-dwelling ancestors to today’s fully marine whales. ... One such “walking whale” is Ambulocetus (am-bew-lo-SEAT-us) natans, which lived about 49 million years ago in what is now northern Pakistan, in long-lost coastal shallow seas ...

Ambulocetus (Latin ambulare "to walk" + cetus "whale") is a genus of early amphibious cetacean [a] from the Kuldana Formation in Pakistan, roughly 48 or 47 million years ago during the Early Eocene ().It contains one species, Ambulocetus natans (Latin natans "swimming"), known solely from a near-complete skeleton. Ambulocetus is among the best-studied of …

Whales that evolved after Ambulocetus (Kutchicetus, etc.) show even higher levels of saltwater oxygen isotopes, indicating that they lived in nearshore marine habitats and were able to drink saltwater as today’s whales can. These animals evolved nostrils positioned further and further back along the snout.

Anatomy: The name Ambulocetus means “walking whale,” thus it should not be surprising that this ancient whale looked very different from modern cetaceans. Ambulocetus had a long and flexible neck, front limbs with flexible wrists and fingers, powerful legs with large feet, and a long and robust tail that likely lacked tail flukes.

游走鲸，拉丁文名ambulocetus natans（即步行的鲸类），别称走鲸、陆行鲸，为哺乳纲鲸目动物，分布在 巴基斯坦 一带，摄食习性为肉食性，大约生活在四千九百万到五千万年前（始新世）。 游走鲸是一种早期的 鲸鱼 ，可以同时行走及游泳，是一种半水生哺乳动物。 。游走鲸的 化石 在巴 …

2019年3月6日 · Ambulocetus dates from the early Eocene epoch, about 50 million years ago, when the ancestors of modern whales were literally just dipping their toes into the water: this long, slender, otter-like mammal was built for an amphibious lifestyle, with webbed, padded feet and a narrow, crocodile-like snout.

Whale hearing. Whales have certain adaptations for hearing underwater. Ambulocetus has the thickened bullae lik Pakicetus but also the beginnings of a channel linking jaw to ear, which it may have used to pick up vibrations from the ground, as modern crocodiles do [Wong in SciAm pages 187-8 2002]. Modern whales can hear directionally.

Ambulocetidae is a family of early cetaceans from Pakistan.The genus Ambulocetus, after which the family is named, is by far the most complete and well-known ambulocetid genus due to the excavation of an 80% complete specimen of Ambulocetus natans. [2] The other two genera in the family, Gandakasia and Himalayacetus, are known only from teeth and mandibular fragments. [3]

Although whales are expert swimmers and perfectly adapted to life underwater, these marine mammals once walked on four legs. ... One species of these relatives was called Ambulocetus. It lived in or near estuaries about 50 to 48 million years ago. Like Pakicetus, it spent time both in and out of water, but its large feet looked more like ...

2013年9月9日 · In Depth Ambulocetus is a very important transitional fossil as it displays the link between terrestrial mammals and the early whales.‭ ‬Ambulocetus acquired its name‭ ‬from the idea that it could‭ ‬both‭ ‬swim by undulating its back as well as leave the water and walk on land. However a 2016 study by Ando & Fujiwara suggests that …