A mammal which lays eggs is

Options

A. Scaly Anteater
B. Spiny Anteater
C. Porcupine
D. Hedgehog

Answer

To answer the question "A mammal which lays eggs is," we need to identify the specific group of mammals that exhibit this unique reproductive trait. Here’s a step-by-step solution:

### Step 1: Understand the Classification of Mammals
Mammals are classified into three main groups based on their reproductive methods:
- **Monotremes**: Egg-laying mammals.
- **Marsupials**: Mammals that give birth to underdeveloped young, which often continue to develop in a pouch.
- **Eutherians**: Also known as placental mammals, which give birth to more fully developed young.

### Step 2: Identify Monotremes
Among these groups, only monotremes lay eggs. This is a distinctive characteristic that sets them apart from other mammals.

### Step 3: Examples of Monotremes
The most well-known examples of monotremes are:
- The **platypus** (Ornithorhynchus anatinus)
- The **echidna** (Tachyglossidae family)

### Step 4: Conclusion
Therefore, the answer to the question "A mammal which lays eggs is" would be:
- **Platypus** or **Echidna**.

### Final Answer
A mammal which lays eggs is the **platypus** or **echidna**.

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