Great argus Argusianus argus

The great tail- and wing-fanning courtship display of the male Great Argus is among the most remarkable on Earth. At rest, the long feathers and tail feathers give the blue-headed male an excessively lengthy, freight-train-like appearance. Female more warmly colored than male but lacks long plumes and has paler blue head. Inhabits lowland to foothill forests with a relatively thin understory and mature trees, from which the male’s lovelorn-sounding courtship call “kow-WOW” resonates loudly, even as it remains frustratingly hidden.