From Charles Montange:

Re: Ravens show things to partners, a rare ability, study finds (Nov. 29): While in the Galapagos Islands, I saw a flightless cormorant repeatedly show non-food objects to its mate, on their "nest." If she liked the object, she would carefully place it in a spot around the nest. If she did not, she would ignore it. The cormorant would then dive off to retrieve another object to display to her.