Matsayi yana da nauyin kilo 22.7 zuwa 45.4 (50 zuwa 100 lb) kuma ya bambanta ta hanyar jima'i, tare da maza suna auna fiye da mata. Yana da nau'in tsuntsaye na biyar mafi girma a rayuwa, bayan kawai nau'o'in nau'o'in ratites. Nauyin ya bambanta ta kakar, kamar yadda maza da mata na penguins sun rasa babban taro yayin da suke tayar da hatsi da kuma incubating qwai. Wani namiji penguin dole ne ya jimre da matsanancin sanyi na Antarctic na tsawon watanni biyu yayin da yake kare qwai. Ba ya cin komai a wannan lokacin. Maza emperor penguins za su rasa kimanin 12 lb (26 kg) yayin da suke jira don qwai su hatsi. Nauyin maza a farkon kakar kiwo yana da nauyin kilo 384 (50 zuwa 100 lb) kuma ya bambanta ta hanyar jima'i, tare da maza suna da nauyin nauyin fiye da mata fiye da 29.5 lb. A lokacin da aka kama shi a cikin dogon lokaci, a lokacin da aka kama shi a matsayin mai launin ruwan hoda da launin ruwan hoda, a lokacin da aka kama shi a matsayin mai launin ruwan hoda da launin
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