Explanation by: Official MCQ Buddy

Echidnas are monotremes, a special group of mammals that lay eggs instead of giving birth to live young. Along with the platypus, echidnas are the only egg-laying mammals.

Why not the other options?

  • (A) Kangaroo → A marsupial that gives birth to live young, which continue developing in the pouch.
  • (B) Whale → A marine mammal that gives birth to live young.
  • (D) Porcupine → A placental mammal that gives birth to live young.

Thus, echidna is the only correct answer.

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