Sentence:  Four varietles of pigeon still exist in a wild state in France—the <WSD>biset</WSD>, the wood pigeon, the rock pigeon, and the turtledove. The <WSD>biset</WSD> variety is the foundation of all domesticated varieties in France. 
Meaning of the word marked with <WSD> tags:  A species of pigeon, "Columba livia".