Closely resembles Southern Beardless-Tyrannulet. Difficult to distinguish on the basis of plumage, but presents an overall more faded, paler, and washed out appearance (with belly at most pale yellowish, instead of the pale clear of Southern).
Northern Beardless-Tyrannulet replaces the Southern Beardless-Tyrannulet in Middle America, and it is fairly common in semiopen areas with scrub, gallery woodland, gardens, and in borders of secondary woodlands on Pacific slope.
Habits and Behavior
Behavior of the Northern and Southern Beardless-Tyrannulet is very similar, as are their vocalizations. Northern's song is a series of four or five clear melancholy descending notes, while its call is a rather loud and sharp pee-yeép.