MacGillivray's Warbler - Oporornis tolmiei
Global Rank:
G5
State Rank:
S5B
Agency Status
USFWS:
none
USFS:
none
BLM:
none
CFWCS Tier:
3
PIF:
3
General Description
Generally shy and elusive and often difficult to detect. A small wood-warbler, 10-15 cm. Green above, yellow below, with gray hood. White eye crescents, 1 above and below each eye, present in all plumages. Immatures have yellow underparts, olive-green upperparts and eye crescents, brown-gray (not gray) hood; throat tends to be grayish white. (Pitocchelli, Jay. The Birds of North America, No. 159, 1995).
Distribution
Montana Range
Observations in Montana: 7929
Montana CountiesBeaverhead, Big Horn, Blaine, Broadwater, Carbon, Cascade, Chouteau, Custer, Dawson, Deer Lodge, Fallon, Fergus, Flathead, Gallatin, Glacier, Golden Valley, Granite, Hill, Jefferson, Judith Basin, Lake, Lewis and Clark, Liberty, Lincoln, Madison, McCone, Meagher, Mineral, Missoula, Park, Petroleum, Phillips, Pondera, Powder River, Powell, Ravalli, Rosebud, Sanders, Sheridan, Silver Bow, Stillwater, Sweet Grass, Teton, Toole, Valley, Wheatland, Yellowstone
Migration
In Bozeman area, normal migration periods are May 25-June 5 and Aug 20.
Habitat
Commonly found in riparian habitat and clearcuts of northern coniferous forests along the Rocky Mountains. Forages along streams or in dense second growth. (Pitocchelli 1995).
Food Habits
Main food is insects. Feeds on or just above the ground. (Pitocchelli 1995).
Reproductive Characteristics
Nests in riparian habitat along river and stream banks, also steep coulee slopes, undergrowth of deciduous and mixed-woods forests, logging clearcuts and areas recovering from avalanches. Cup nest. Clutch size is 3 - 5 eggs. Eggs are short, ovate, creamy white, spotted neutral/brown. (Pitocchelli 1995). Near Fortine, egg dates range from Jun 7-Jun 30. In northwest Montana, it nests from second week in June into third week of July.