Which mammal excretes solid urine to avoid water loss? (A) Crow (B) Kangaroo rat (C) Camel (D) Squirrel

Options

A. Crow
B. Kangaroo rat
C. Camel
D. Squirrel

Answer

To solve the question "Which mammal excretes solid urine to avoid water loss?" we can follow these steps:

### Step 1: Understand the Question
We need to identify which of the given mammals has the ability to excrete solid urine as a mechanism to conserve water.

### Step 2: Analyze the Options
We have four options to consider:
- (A) Crow
- (B) Kangaroo rat
- (C) Camel
- (D) Squirrel

### Step 3: Evaluate Each Option
- **Crow**: This is a bird, not a mammal, so it can be eliminated.
- **Kangaroo rat**: Known for its adaptations to arid environments, including highly efficient kidneys that can produce very concentrated urine.
- **Camel**: While camels are adapted to conserve water, they do not excrete solid urine; they produce concentrated liquid urine.
- **Squirrel**: Squirrels do not have any special adaptations for water conservation like the kangaroo rat.

### Step 4: Identify the Correct Answer
From the evaluation, the kangaroo rat stands out as the mammal that excretes almost solid urine, allowing it to conserve water effectively in its desert habitat.

### Conclusion
The correct answer is (B) Kangaroo rat.

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