Possible Clues:

• Civil Rights-era racial identification
• Opposite of blanco (Sp.)
• Go on about Reg when one is in the dark Columbian river
• Part of U.N.C.F.
• Name of several South American rivers
• South American river
• Gone and got black about R
• Has R gone and got black?
• No, Reg will always keep it dark
• Amazon feeder