noun
green peafowl
Refers specifically to Pavo muticus, a species of peafowl native to Southeast Asia.
マクジャクは東南アジアの森林に生息している。
The green peafowl inhabits the forests of Southeast Asia.
孔雀 is the general term for peafowl, including the Indian peafowl (Pavo cristatus). マクジャク specifies the green peafowl species.
The reading まくじゃく is likely a phonetic adaptation, possibly from Chinese or a regional name. The kanji 真孔雀 literally means 'true peafowl', distinguishing it from the more common Indian peafowl.