Correct Answer - Option 3 : Penguin
The correct answer is Penguin.
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Mammals are a class of Chordates with the following features:
- They are warm-blooded animals and give birth to their young ones, except the monotremes.
- They have mammary glands which help them to feed their babies.
- Their skin possesses hair and has sebaceous glands and sweat glands.
- They possess cervical vertebrae, their skull is dicondylic, and have 12 pairs of cranial nerves.
- Cow, platypus, and Dolphin belong to the mammal category.
- Penguins are a group of aquatic flightless birds.
- The penguin's body is adapted for swimming.
- Its body is fusiform (tapered at both ends) and streamlined.
- A penguin has a large head, short neck, and elongated body.
- The legs and webbed feet are set far back on the body, which gives penguins their upright posture on land.
Therefore penguins do not belong to the mammal category.
