What is Allen's Rule ?

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Allen's Rule**: Allen's Rule is an ecological principle that explains how the physical characteristics of warm-blooded animals (mammals and birds) are adapted to their environments, particularly in relation to temperature.

2. **Focus on Climate**: The rule specifically addresses the adaptations of these animals in different climatic conditions, particularly contrasting colder and warmer climates.

3. **Adaptations in Cold Climates**: According to Allen's Rule, mammals and birds that inhabit colder climates tend to have shorter body parts. This includes:
- Shorter ears
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