White-fronted Tyrannulet

The white-fronted tyrannulet is about 11 to 12.5 cm (4.3 to 4.9 in) long and weighs about 12.5 g (0.44 oz). The sexes have the same plumage. Adults of the nominate subspecies P. z. zeledoni have a slate colored crown and nape and an olive-green back and rump. Their forehead ("front") is white and the color extends through the lores and over the eye. They have a narrow dusky line through the eye and their face below it is grizzled whitish. Their wings are dusky with two yellow bars. Their tail is olive-green. Voice: What is thought to be the white-fronted tyrannulet's song is "a high-pitched and piercing 'tzeeee' or 'sweeeu' either given as a protracted series of single notes sometimes in a descending series of up to 5–7 notes". It typically vocalizes the most in the morning.