In birds, the alimentary canal ends in three chambered_______.

Explanation

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

1. **Understanding the Alimentary Canal in Birds**: The alimentary canal is the pathway through which food passes in an organism. In birds, this canal has a specific endpoint.

2. **Identifying the Endpoint**: In birds, the alimentary canal ends in a structure that serves multiple purposes. This structure is known for its unique three-chambered design.

3. **Naming the Structure**: The three-chambered structure at the end of the alimentary canal in birds is called the **cloaca**.

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