I can see where you're coming from with the starlings - the always remind me of toughs from bad 50s biker films, all leather jackets & big quiffs, hanging about on street corners & shouting at nuns
Sparrowhawks are seedy yet aristocratic middle-aged men cruising for virgins to take advantage of, a bit like the character from the fast show "Me? The 13th Earl of Wimbourne? Here in a woman's prison? At 3.30 in the morning...?"