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Ambulocetidae
Ambulocetidae is a family of early cetaceans from Pakistan that still were able to walk on land. 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''. The other two genera in the family, ''Gandakasia'' and ''Himalayacetus'', are known only from teeth and mandibular fragments.
==Description==
The most basal of amphibious marine cetaceans, ambulocetids lived in shallow near-shore environments such as estuaries and bays, but were still dependent on freshwater during some stage of their life. Some of the characteristics related to sound transmission found in the lower jaws of modern whales that were absent in pakecetids are present in ambulocetids. They probably swam by paddling their large feet, which is not a very efficient mode of locomotion, suggesting they ambushed rather than chased prey. Ambulocetids had a narrow head with eyes facing laterally, giving them an appearance similar of theropod dinosaurs
''Ambulocetus'' and ''Gandakasia'' primarily ate terrestrial prey, while a combination of low oxygene isotope and high carbon isotope values suggests that ''Himalayacetus'' consumed freshwater but ate marine prey, thus that it foraged in a marine environment but returned on land to drink.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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