name of the additional chambers found in the digestive tract of birds:

Answer

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the names of the additional chambers found in the digestive tract of birds.

2. **Identify the Digestive Tract of Birds**: The digestive tract of birds includes several parts: esophagus, crop, proventriculus, gizzard, small intestine, large intestine, ceca, and cloaca.

3. **Recognize the Additional Chambers**: In birds, the additional chambers that are not typically found in other vertebrates are the crop and the gizzard.

4. **Define the Function of Each Chamber**:
- **Crop**: This chamber serves as a storage area for food after it is swallowed. It allows birds to store food temporarily before it moves on to the next part of the digestive system.
- **Gizzard**: This chamber is responsible for grinding the food. Birds often ingest small stones that help in the mechanical breakdown of food, similar to chewing.

5. **Conclude the Answer**: The two additional chambers in the digestive tract of birds are the **crop** and the **gizzard**.

### Final Answer:
The additional chambers found in the digestive tract of birds are the **crop** and the **gizzard**.

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