Possible Clues:

• Old school report? Have a word with the man upstairs - the flighty type!
• Piscivorous bird
• Very large game bird
• Powerful bird
• Large seabird is duck's victim
• Bird seen by very large quarry
• So the predator is back from above with its victim
• A bird like this turned up over quarry
• Large bird preying on fish in inland waters
• Hunting bird that circles its target