Homoiothermal animals are

Options

A. Frog , Lion and Fish
B. Bat , Pigeon and Rabbit
C. Pigeon , Lizard and Tortoise
D. Rat , Snake and Crocodile .

Answer

### Step-by-Step Solution:

1. **Definition of Homoiothermal Animals**: Homoiothermal animals, also known as warm-blooded animals, are those that can maintain a constant body temperature regardless of external environmental conditions.

2. **Examples of Homoiothermal Animals**: The primary examples of homoiothermal animals include mammals and birds. For instance, humans maintain an average body temperature of approximately 37 degrees Celsius, even when external temperatures vary significantly (e.g., from 0 degrees to 50 degrees Celsius).

3. **Comparison with Poikilothermals**: In contrast to homoiothermal animals, poikilothermals (or cold-blooded animals) cannot regulate their body temperature internally. Their body temperature fluctuates with the surrounding environment. Examples of poikilothermals include fish, amphibians, and reptiles.

4. **Identifying the Correct Option**: Given the question about homoiothermal animals, we need to identify which group includes only homoiothermal animals. The options provided are:
- Option 1: Fish (cold-blooded)
- Option 2: Pigeon (bird), and two mammals (warm-blooded)
- Option 3: Lizard and tortoise (both reptiles, cold-blooded)
- Option 4: Snake and crocodile (both reptiles, cold-blooded)

5. **Conclusion**: The correct answer is **Option 2**, as it includes a bird (pigeon) and two mammals, all of which are homoiothermal animals capable of maintaining a stable body temperature.