For the most part eagles have more similarities than differences. We get the question a lot. Who is who or how do you tell them apart? When they are together it is a bit easier simply because Lucy is larger than Larry. In the eagle world, the female is larger than the male. One characteristic is where the white feathers meet the dark feathers around the neck line. Lucy's neck feathers tend to split like an upside down V or they appear missing under her neck. Larry's white feathers tend to be more consistent. When observing Again, Larry is smaller. The head on Larry is more streamlined or his whit feather appear more slicked back while Lucy's head is broader and her white feathers apear more wind blown. Lucy has a few dark feathers on top of her head as well. This was not present last season. This could be due to stress or possibly while she was injured and they grew in dark.
One last feature is their tail fan. Lucy's tail fan appears to come more to a point, while Larry's fan is more squared off.
See the pointy tail feathers on Lucy (left)?
Neckline is inconsistent going across.
See the dark feathers on her head?