aurantious = orange or yellow-orange, the color of an orange. See aurantiaceous.
Ploceus aurantius is the Orange Weaver; Arremon aurantiirostris is the Orange-billed Sparrow; Catharus aurantiirostris is the Orange-billed Nightingale Thrush; Heterocercus aurantiivertex is the Orange-crowned Manakin.
aurantious (aurantius) = the color of an orange (A familiar introduction to the history of insects; being a new and greatly improved edition of the grammar of entomology, entry 489. E. Newman, 2016).