In birds, urinary bladder is present in

Options

A. Parrot
B. Ostrich
C. American Rhea
D. Both B and C

Answer

To solve the question "In birds, urinary bladder is present in," we will analyze each option provided and understand the general characteristics of birds regarding their urinary system.

### Step-by-Step Solution:

1. **Understanding the Urinary Bladder in Birds**:
- The urinary bladder is an organ that stores urine before it is excreted. In most birds, this organ is absent because they excrete uric acid, which is less toxic and conserves water.

2. **Identifying the Excretory Product**:
- Birds are classified as uricotelic animals, meaning they primarily excrete uric acid. This adaptation helps them conserve water, which is crucial for flight.

3. **Analyzing the Options**:
- **Option A: Parrot**:
- Parrots do not have a urinary bladder. They excrete uric acid mixed with feces through the cloaca.
- **Option B: Ostrich**:
- Ostriches are unique among birds as they do possess a urinary bladder. They separate urine and feces, allowing them to store urine before excretion.
- **Option C: American Rhea**:
- The American Rhea does not have a true urinary bladder but has an expansion in the cloaca that functions similarly to a urinary bladder, allowing for the temporary storage of urine.

4. **Conclusion**:
- Based on the analysis, the correct answer is that the urinary bladder is present in both the ostrich (Option B) and the American Rhea (Option C). Therefore, the answer is **both B and C**.

### Final Answer:
The urinary bladder is present in **both B (Ostrich) and C (American Rhea)**.