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Animals like whale, walrus live in water...

Animals like whale, walrus live in water (ocean). Whether they are included in Pisces or Mammalia?

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i.Animals like whale and walrus live in water (ocean), yet they are classified under class Mammalia. It is because they show characters similar to mammals and not to Pisces.
ii.Whale and walrus are warm-blooded animals (Homeothermic), whereas Pisces are cold- blooded (poikilothermic).
iii. These animals respire through their lungs, whereas in Pisces, respiration occurs through gills.
iv. Whales and walrus have mammary glands, which is a characteristic feature of mammals.
v.Whales and walrus exhibit characters of mammals and are known as aquatic mammals.
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