MacGillivray's Warbler
Geothlypis tolmiei
MacGillivray's warbler is 10 to 15 cm (3.9 to 5.9 in) long, weighs 9 to 13 g (0.32 to 0.46 oz), and has a wingspan of 19 cm (7.5 in). Adult males of the nominate subspecies have a mostly medium gray head and nape that often has a brownish or olive wash. They have darker gray to blackish lores and line through the eye and wide white crescents above and below the eye. Their back, rump, and uppertail coverts are yellowish olive-green. Their wings and tail are blackish brown with olive-green feather edges. Their throat and upper breast are medium gray, often with a brownish wash. Voice: The primary song of male MacGillivray's warbler is "6-8 syllables described as churry churry churry churry cheery cheery". Both sexes make calls, "a harsh chip note" and "a high-frequency chip". Males sing mostly at dawn and dusk, typically from a high perch.
ID text from Wikipedia, CC BY-SA 4.0
Mourning Warbler
Geothlypis philadelphia
Mourning warblers are small songbird with yellow underparts, olive-green upperparts, a thin pointed bill and pink legs. Adult males have a gray hood, black lores and a black patch on the throat and breast. In the fall, this pattern becomes less bright and harder to distinguish from similar species; however they never have a broken eye ring. Females and immatures are gray-brown on the head with an incomplete eye-ring. They have a yellow-gray throat with a brown or olive tint to their breast. Both sexes can range from 10 to 15 cm (3.9–5.9 in) in length and 11–13 g (0.4–0.5 oz) in weight. Voice: The song of this bird is a bright repetitive warble. The warble consists of rolling phrases that sound that typically lower in volume at the end and can sound like "chirry, chirry, chirry, chorry, chorry." The call is a sharp chip. There are usually two different pitched calls, with one higher than the harsh chip.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: MacGillivray's Warbler and Mourning Warbler.