Possible Clues:

• Duck seized by male or female raptor or other bird
• Bird that could be male duck or female avian predator
• Red grouse
• Grouse getting audibly nastier
• Grouse making nastier sound
• Grouse or duck seized by male or female bird of prey
• Grouse, less pleasant when voiced out loud
• Grouse about initial radio transmission of space
• Sounds as if Othello was foul enough to get the bird