Short-tailed Pygmy Tyrant

The short-tailed pygmy tyrant is 6 to 7 cm (2.4 to 2.8 in) long and weighs about 4.2 g (0.15 oz). It is the smallest passerine on Earth. The sexes have the same plumage. Adults of the nominate subspecies have a mostly dark gray head with blackish lores, a prominent white spot above the lores, and a white eye-ring; the last two give a spectacled appearance. Their back, rump, and uppertail coverts are bright olive green. Their wings are dusky with bright olive edges on the flight feathers and tips on the coverts; the latter show as two faint wing bars. Voice: Sources compare the short-tailed pygmy tyrant's vocalizations to sounds made by insects and frogs. The most common is "a soft trilled, purr-like call, sometimes leading into long series of short, squeaky "creek" notes beginning slowly and accelerating, 'cre'e'e'e'e', k'e'e'e'e' ". Another rendition is teeeee-tuuuuur. Its calls include "high, rising treet or peet?