Animals of desert are :

Options

A. Arboreal
B. Fossorial
C. Crepuscular
D. Nocturnal

Answer

To determine which type of animals are typically found in desert environments, we need to analyze the characteristics of each option provided: arboreal, fossorial, crepuscular, and nocturnal.

### Step-by-Step Solution:

1. **Understanding Desert Conditions**:
- Deserts are characterized by extreme dryness and high temperatures. This environment poses challenges for survival, such as limited water availability and intense heat during the day.

2. **Evaluating Arboreal Animals**:
- Arboreal animals are those that live in trees. In a desert, trees are scarce, and being exposed to high temperatures in trees would be detrimental. Therefore, desert animals cannot be arboreal.

3. **Evaluating Fossorial Animals**:
- Fossorial animals are those that burrow underground. This behavior is advantageous in a desert because the underground temperature is cooler than the surface temperature. Thus, many desert animals can be fossorial, allowing them to escape the heat.

4. **Evaluating Crepuscular Animals**:
- Crepuscular animals are active during dawn and dusk. While some desert animals may exhibit this behavior to avoid the heat of the day, not all desert animals can be classified as crepuscular. Cold-blooded animals, for instance, may struggle to remain active during these cooler times.

5. **Evaluating Nocturnal Animals**:
- Nocturnal animals are active at night. Similar to crepuscular animals, while some desert animals are nocturnal to avoid daytime heat, not all desert animals fit this category.

6. **Conclusion**:
- After analyzing all options, we conclude that the most suitable classification for desert animals is **fossorial**. These animals can burrow underground to escape the extreme temperatures of the desert environment.

### Final Answer:
**Animals of the desert are primarily fossorial.**

---