Stripe-crowned Spinetail

The stripe-crowned spinetail is 13 to 16 cm (5.1 to 6.3 in) long and weighs 10 to 16 g (0.35 to 0.56 oz). It is a smallish member of genus Cranioleuca and has unique crown and tail patterns. The species shows considerable plumage variation following Gloger's rule. The sexes have the same plumage. Adults of the nominate subspecies have a wide white supercilium, dark brown lores, dark brown behind the eye, and mixed whitish and brown ear coverts. Their crown is dramatically striped with blackish and buffy brown; the stripes are fainter in southern Brazil and Paraguay. Voice: One song of the stripe-crowned spinetail is "an accelerating, descending trill without introductory notes" also described as "an accelerating tee teetee titititit... ending in a trill. Another is a "few widely spaced metallic 'tick' notes followed by rapid series of high, descending, bubbly, clicking 'chack' notes". Its calls include a "soft, metallic 'tck' or rapid 'tidrrit' " and "wrrru".