THE BIRDS OF THE MOY ESTUARY. 329 
may be seen near Belleek demesne and Moyfort, about a mile 
below the town of Ballina. 
Redbreasted Merganser, Meryus serrator.—Resident and com- 
mon, breeding on Lough Conn and other suitable lakes. ‘They 
sometimes assemble in large flocks on the river near Roserk, and 
on May 2nd I saw a flock of twenty-four birds close to the shore 
here, all of which appear to have paired. 
Eared Grebe, Podiceps auritus.—Very rare. In February, 1852, 
I] saw a pair of Grebes in the Moyne channel, and one which 
I shot proved to be an Eared Grebe in immature plumage. 
Little Grebe, Podiceps minor.—Resident and breeds on the 
little loughs throughout the district. During the winter a little 
party of five or six birds generally come down to the river and 
haunt the shores of the islands near Bartragh until March. 
Great Northern Diver, Colymbus glacialis.—A regular winter 
visitant. Its favourite haunts are in the bay and estuary, where 
during winter and spring a few may be always seen. They 
generally take their departure for their summer quarters about the 
latter end of April or beginning of May, although sometimes they 
remain later. Before leaving many assume the summer plumage. 
On the 24th May, 1851, I had the pleasure of seeing a sight not 
often witnessed, viz. a flock of ten Northern Divers, nine of which 
exhibited the beautiful plumage of summer. I met with them in 
the open bay between Bartragh and Killcummin Head, and they 
had evidently congregated in preparation for their final departure. 
Red-throated Diver, Colymbus septentrionalis.—More numerous 
than the last mentioned. Many assume the breeding plumage 
before leaving in April and May. 
Black-throated Diver, Colymbus arcticus.—Very rare. One 
exhibiting the fine black throat, and apparently in full summer 
plumage, was seen by my brother, Mr. E. H. Warren, near Bartragh, 
in April, 1851. 
Common Guillemot, Uria troile—Very common, and breeds in 
large numbers on the cliffs of Downpatrick Head. 
Ringed Guillemot, Uria lachrymans.—Has been obtained on 
two occasions. On October 23rd, 1862, I shot one in the channel 
near here, and on the 23rd April, 1875, I killed a second one in 
the Moyne channel. . 
Black Guillemot, Uria grylle.—Resident. Breeding in very 
limited numbers between Kilcummin and Downpatrick Heads. 
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