Life And Rock a Span Classsearchtermspan Classsearchtermcollections

Cover Life And Rock a Span Classsearchtermspan Classsearchtermcollections
Life And Rock a Span Classsearchtermspan Classsearchtermcollections
Richard Lydekker
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} shortly before the head reaches the surface. In all their internal structures, as well as in the mode of production and nourishing of their young, cetaceans conform strictly to the ordinary mammalian type ; and we accordingly see that their assumption of a fish -like form is, with the exception of the loss of the hind limbs and the modifi- cation of the front pair into flippers, mainly superficial. In departing from the fish-type in having the expansion of the tail- fin horizontal instead of ...vertical, the necessity of having an organ capable of bringing them rapidly to the surface has been the inducing cause ; while in order to prevent their blood from being reduced below the proper temperature by the chill of the surrounding water, the whole body is invested with a thick layer of oily fat, commonly known as the blubber, beneath the skin.
Existing cetaceans are divisible into two great groups, distinguished as the whalebone whales and the toothed whales ; the latter group including sperm-whales, together 58 TOOTHED WHALES AND THEIR ANCESTRY.


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