Birds posses narrow wings in colder climate related to :

Options

A. Bergama's
B. Jordan's Rule
C. Ranch's Rule
D. Allen's Rule

Answer

To answer the question "Birds possess narrow wings in colder climates related to:", we need to analyze the options provided and understand the relevant ecological rules.

### Step-by-Step Solution:

1. **Identify the Relevant Ecological Rules:**
- We need to consider different ecological rules that explain adaptations of animals in relation to their environments. The relevant rules include Bergmann's Rule, Jordan's Rule, Rensch's Rule, and Allen's Rule.

2. **Understand Bergmann's Rule:**
- Bergmann's Rule states that warm-blooded animals in colder climates tend to be larger than those in warmer climates. This rule does not specifically address wing shape.

3. **Understand Jordan's Rule:**
- Jordan's Rule pertains to fish, stating that fish in colder waters tend to have more vertebrae. This rule is not applicable to birds and wing shape.

4. **Understand Rensch's Rule:**
- Rensch's Rule suggests that in some cases, the size of animals can vary with temperature, but it does not specifically address wing shape in birds.

5. **Understand Allen's Rule:**
- Allen's Rule states that the extremities (like ears, tails, and limbs) of mammals in colder climates are shorter than those in warmer climates. While this rule addresses extremities, it does not specifically mention wings.

6. **Identify Rensch's Rule as the Correct Answer:**
- Rensch's Rule indicates that birds in colder climates tend to have narrower wings compared to those in warmer climates. This adaptation helps reduce heat loss, as narrower wings minimize the surface area exposed to cold air.

7. **Conclusion:**
- Therefore, the correct answer to the question is that birds possess narrow wings in colder climates related to **Rensch's Rule**.