Which one of these animals is not a homoetherm ?

Options

A. Psittacula
B. Camelus
C. Chelone
D. Macropus

Answer

To determine which animal from the given options is not a homeotherm, we first need to understand the definitions of homeothermic and poikilothermic animals.

### Step-by-Step Solution:

1. **Define Homeotherms**: Homeothermic animals, also known as warm-blooded animals, maintain a stable internal body temperature regardless of the external environment. Examples include mammals and birds.

2. **Define Poikilotherms**: Poikilothermic animals, or cold-blooded animals, have body temperatures that fluctuate with the temperature of their environment. They cannot regulate their body temperature internally. Examples include reptiles, amphibians, and most fish.

3. **Analyze the Options**:
- **Sitakula (Sitacula)**: This is a type of parrot, which is a bird. Birds are typically homeothermic.
- **Camelus**: This refers to camels, which are mammals. Mammals are also homeothermic.
- **Calon**: This term is unclear in the context, but if it refers to a type of fish or similar organism, it is likely to be poikilothermic.
- **Macropus**: This is a genus that includes kangaroos, which are marsupials and homeothermic.

4. **Identify the Non-Homeotherm**: From the analysis, if Calon refers to a fish or similar organism, it would be the one that is not a homeotherm. Therefore, the correct answer to the question is **Calon**.

### Final Answer:
The animal that is not a homeotherm is **Calon**.