Possible Clues:

• Extinct dumb cluck
• Large extinct bird
• There are no more to do like this, by the sound of it
• Perform at the double and no more of that
• Bygone avian
• Old bird going from one party to another
• It's extinct? Make two copies
• It became extinct less than 100 years after its discovery
• There's no more to do, by the sound of it
• Proverbially extinct bird