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Q. Which of the following are egg-laying mammals?
  1. Platypus
  2. Echidna
  3. Otter
  4. Koala
Select the correct option from the codes given below:
Answer: Only 1 & 2
Notes: Platypus and echidna are the only egg-laying mammals, classified as monotremes and found in Australia and New Guinea. Otters and koalas are placental mammals, giving birth to live young. There are only five extant monotreme species, with platypus and echidnas as notable examples; the rest are marsupials or placentals.
Question Source: 📚This question has been sourced from GKToday's Target UPSC Prelims for 2026, 2027 & 2028 App Exclusive Course in GKToday Android Application which provides more than 12K Topicwise UPSC Prelims General Studies questions with explanations framed on UPSC pattern. Download the app here.
📌 Question Number: 8 in 102: Biological Classification in the above course in App.