Northern Schiffornis

The northern schiffornis is 15.5 to 16.5 cm (6.1 to 6.5 in) long and weighs about 20 to 40 g (0.71 to 1.4 oz). The sexes have the same plumage. Adults of the nominate subspecies S. v. veraepacis have an indistinct pale ring around the eye on an otherwise dark brownish olive face. Their upperparts and tail are dark brownish olive. Their wings are a warmer brown. Their throat and breast are brownish olive and their belly and vent grayish olive. Subspecies S. v. dumicola is darker and more olive than the nominate, with little difference between their back and breast. S. v. Voice: The northern schiffornis sings mostly in the early morning. Its song is a variable "sequence of normally 2–4 clear, rich musical whistles, last one sharply upslurred". It is written as "deeeeeu whee-chee or sometimes two-note dweeeer weet" in Mexico, "twick-sweet-twee" on the Panama/Colombia border, and "a very slow teeeeu, weee-tí or teeeeeew tui-chuEEE?" in Ecuador.