Cataridon Valley, Peru.
Hitherto treated as conspecific with A. lutescens, but differs in its clearer whitish supercilium (at least 1); slightly broader, more diffuse dark streaks on upper breast, without buff fringes, and extending onto flanks (2); stony-white vs yellowish-white underparts (1); longer wing but shorter tail (effect size 2.4 and –2.46 respectively; score 2+2=4); very different song and call, already noted in literature, call a dry “chit-it” vs “chu-ee”#R, song a rather long series (6–16) of short notes given at regular pace, followed by a strange drawn-out buzzy or sizzling note and often ending with a short high-pitched note vs typically 1–3 short notes (occasionally more, when initiating display-flight) followed by a very nasal buzz descending in pitch, hence differing in number of initial notes (score 3), lack of any frequency drop (score 3) and sizzling note being actually a very fast series of separate notes rather than a continuous nasal note (ns)#R. Molecular evidence is now available to support this split#R. Monotypic.
Coastal Peru (S from Piura) S to extreme N Chile (Arica).
Food and feeding
Status and conservation
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