sentences:  Cinereous vulture ("Aegypius monachus"), being similarly dusky overall below, have been suggested as confusion species, but are much larger than imperial eagles with differing proportions (far broader wings, proportionately smaller head and shorter tail) and lack any of the contrasting pale parts of the imperial eagle’s plumage.The eastern imperial eagle is quite vocal on their breeding ground but tends to be silent or nearly so elsewhere.The main call of the species is a deep, harsh bark "owk owk", "gok gok" or "kraw-kraw".