Possible Clues:

• "Two owls and ---...": Lear
• 'Two owls and __': Lear limerick line
• "Two owls and __": Lear limerick line
• '___ is only an egg's way of making another egg' (Samuel Butler)
• "___ is only an egg's way of making another egg" (Samuel Butler)
• 'Two owls and ___ ...': Lear