**Odd One Out: Parrot, Crow, Fish, Eagle**

The odd one out among the given options is Fish.

**Reason:**

1. **Category:** The parrot, crow, and eagle all belong to the category of birds, while the fish belongs to the category of aquatic animals.

2. **Habitat:** Parrots, crows, and eagles are primarily found in different habitats on land, whereas fish live in water bodies such as rivers, lakes, and oceans.

3. **Physical Characteristics:** Parrots, crows, and eagles have wings and can fly, while fish have fins and are adapted to swim in water.

4. **Respiration:** Parrots, crows, and eagles breathe through lungs and require air to survive, whereas fish have gills that extract oxygen from water.

5. **Feeding Habits:** Parrots, crows, and eagles are carnivorous and feed on other animals, while fish are mainly herbivorous or carnivorous, depending on their species.

6. **Reproduction:** Parrots, crows, and eagles lay eggs and have internal fertilization, while fish reproduce by laying eggs externally in water.

In conclusion, the odd one out among the given options is Fish because it belongs to a different category (aquatic animals) and has distinct characteristics and habitat compared to the parrot, crow, and eagle (birds).

Fish