Lesser or Greater?

“Lesser or Greater?”

Lesser Scaup
Judy Royal Glenn Photography

Identifying birds is a challenging task for me. There are slight changes amongst a species that makes them different. 
  

The key that helped me identify this bird as a lesser scaup verses a greater scaup was the skinnier black marking on his bill. There are other subtle differences in the head shape and other characteristics that were too difficult for me to distinguish.

Location: Ascarate Lake - El Paso, Texas