CHAPTER III. 
BIRDS. 
TURDIDZ. 
1. TURDUS MIGRATORIUS, Linn. 
Rosin. 
This species was abundant’along the Missouri River, and was also seen in considerable numbers 
in the mountains about Camp Baker and in the Yellowstone Park. 
2, TURDUS SWAINSONI, Cab. 
OLIVE-BACKED THRUSH. 
Quite common along the Missouri above Bismarck. 
3. OREOSCOPTES MONTANUS, (Torens.) Bd. 
MOUNTAIN MOCKINGBIRD. 
I first saw this species on Little Crooked Creek, thirteen miles west of Carroll. It was abundant, 
and doubtless had bred there, as I took some very young birds. It was generally started from the 
ground, whence it would fly to the top of some little sage-bush, where it would sit jerking its tail 
and constantly uttering low cries of anxiety. They were quite shy, and I was often obliged to 
follow them for some distance before I could secure them. 
This species was abundant in the valley of the Yellowstone River. 
4, MIMUS CAROLINENSIS, (Linn.) Gray. 
CATBIRD. 
Quite common along the Missouri River, and very abundant in the Yellowstone Park and in 
the mountains generally. 
5. HARPORHYNCHUS RUFUS, (Linn.) Cab. 
Brown THRUSH; THRASHER. 
This species was seen occasionally in the Missouri River bottom. 
CINCLIDZE. 
6. CINCLUS MEXICANUS, Sw. 
WATER-OUZEL; DIPPER. 
On Cascade Creek, near the Upper Falls of the Yellowstone, we first met with this interesting 
species. Although tolerably familiar with the accounts of its habits given by various authors, I 
