Possible Clues:

• Small diving waterfowl with a long neck
• Loon relative
• Pied-billed ___ (American water bird also known as 'hell-diver,' 'devil diver,' or 'water witch')
• Loon-like diver
• Duck lookalike
• Helldiver, e.g
• Aquatic bird that builds floating nests
• Bird ogre benevolently protects
• Caged by ogre, beautiful bird
• Bird nesting in icebergs going north