Possible Clues:

• In the Pyrenees, a chamois
• Especially in the Pyrenees, another name for chamois
• Monitor possibly not needing large chamois
• Chamois biting head off reptile ...
• Pyrenean chamois
• Antelope biting head off reptile, say
• Goat found in the Pyrenees
• Goat takes off head of reptile
• Chamois in the Pyrenees
• Headless reptile jumping round the Pyrenees