Dart frogs (Phyllobates bicolour, Dendrobates pumilo) found in tropical rain forests of South America are highly poisonous as well as brightly coloured to be easily notice. This is referred to as

Options

A. camouflage
B. mimicry
C. warning colouration
D. none of these

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the phenomenon related to the bright coloration and high toxicity of dart frogs found in tropical rainforests.

2. **Identifying Characteristics**: Dart frogs, such as *Phyllobates bicolor* and *Dendrobates pumilio*, are known for their vibrant colors and potent toxins. Their bright colors serve a specific purpose in nature.

3. **Defining Warning Coloration**: The bright colors of these frogs serve as a warning to potential predators. This adaptation is known as "warning coloration," which indicates that the organism is toxic or unpalatable.

4. **Explaining the Purpose**: The purpose of warning coloration is to deter predators from attacking. When predators see the bright colors, they learn to associate them with toxicity, thus avoiding these frogs in the future.

5. **Differentiating from Other Concepts**:
- **Camouflage**: This is when an organism blends into its environment to avoid detection, which is the opposite of warning coloration.
- **Mimicry**: This involves an organism resembling another species to gain an advantage, but it does not apply to the brightly colored dart frogs.

6. **Conclusion**: Based on the characteristics and definitions discussed, the phenomenon exhibited by dart frogs is referred to as "warning coloration."

### Final Answer:
The brightly colored and highly poisonous dart frogs exhibit a phenomenon known as **warning coloration**.

---