sentences:  The dusky woodswallow was first described by the English ornithologist John Latham in 1801 with the binomial name "Loxia cyanoptera".Its specific epithet is derived from the Ancient Greek words "cyanos" 'blue' and "pteron" 'wing'.The dusky woodswallow is medium-sized and swallow-like, with a dark brown hue, but there have been instances where the bird has appeared grey.