The pond behind my house in the Charleston, S.C. area doesn’t have many duck visitors but today a brace of five Hooded Mergansers spent some time here. At first I thought these were all females, but some research revealed that non-breeding males look this way. I’m thinking the ones with the solid dark bills are the males and the ones with the yellowish lower bill are females. The second photo shows the two types. Am I right or wrong from the jump. Also, if they are non-breeding males are they juveniles who by next year will be rocking the Hoodies distinctive big black and white heads? Thank you.