Possible Clues:

• Trying to sleep, marsupial has sharp pain
• Might the kangaroo cause pain to the perch?
• Settling right in, got so agitated
• Anchoring, gripping claws finally
• Using as perches loops in the knotted string
• Out on a limb, perhaps
• Animal down under hurt in place of sleep?
• Aussie beast has pain sitting down
• Applauding after son's caught settling down to sleep
• Sitting like a bird, right over egg -- smart!