Eggs are covered by leathery shell in:-

Options

A. Birds
B. Amphibians
C. Snakes
D. Prototherians

Answer

To solve the question "Eggs are covered by leathery shell in:", we will analyze each option provided.

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking which group of animals has eggs that are covered by a leathery shell.

2. **Evaluate the Options**:
- **Option 1: Birds**:
- Birds lay eggs that are typically covered by a hard shell made of calcium carbonate. Therefore, this option is incorrect.
- **Option 2: Amphibians**:
- Amphibians usually lay eggs that are surrounded by a jelly-like substance for protection. This option is also incorrect.
- **Option 3: Snakes**:
- Snakes lay eggs that are indeed covered by a leathery shell. This is the correct option.
- **Option 4: Protherians**:
- Protherians are egg-laying mammals (like the platypus) that lay eggs with a hard shell, but not leathery. Thus, this option is incorrect.

3. **Conclusion**: After evaluating all options, the correct answer is **Snakes** (Option 3), as their eggs are covered by a leathery shell.

### Final Answer:
The correct answer is **Snakes**.