The southern beardless tyrannulet is a small flycatcher, 3.7-4 inches (9.4-10.2 cm) in length.
It is grayish-green on its upperparts. It has a grayish throat and a yellowish breast and belly. It has brown wings with two whitish, yellowish, or rusty wing bars. Males and females look alike.
The southern beardless tyrannulet is found in lightly forested areas, cultivated areas, and gardens.
The southern beardless tyrannulet catches insects in flight and also plucks them off vegetation.
The female lays 2-3 eggs in a domed nest. The female incubates the eggs for 14-16 days. The chicks fledge when they are 17 days old.
The southern beardless tyrannulet often sits with its tail cocked up. It calls out with a high “wheer” call.
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The southern beardless tyrannulet breeds from Costa Rica south to Argentina.
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