What is Bidder's canal? Give its function.

Explanation

**Step-by-Step Solution:**

1. **Definition of Bidder's Canal**: Bidder's canal is a structure found in the kidneys of frogs. It plays a crucial role in the reproductive system of male frogs.

2. **Location and Connection**: The Bidder's canal is located close to the testis and kidneys in frogs. It receives sperm from the testis through a series of ducts known as vasa efferentia.

3. **Function of Vasa Efferentia**: The vasa efferentia are small ducts that transport sperm from the testis to the Bidder's canal. This is the pathway through which sperm exits the testis.

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