Aix galericulata November 19, 1909. This morning I saw the drake and one of the ducks copulating in the pond. January December 26, 1910. The drake Mandarin is seen copulating quite frequently. While the drake was in the eclipse plumage last year, I purchased two additional females. When all four of the birds insulted into fresh plumage, the drake accepted one of the new birds as his mate in preference to his old mate. All three of the females exhibited a great deal of jealousy over him. He seemed as vain and proud as ever. About two weeks ago his second mate died; she was slightly the larger of the three females. Before she had been dead two hours, his old mate realized that she was again the "apple of his eye". She is very jealous and persecutes the other female whenever she comes near her or the male. When she and the drake are on a perch, she seems to urge him to drive the persecuted female away if she is on the perch also. The females have a way of making a low, darting, snake-like movement with the head and neck, at the same time opening the bill wide. This is done when they are jealous of the approach.