Courtship plumage of birds (sexual dimorphism), Chromolithograph, published in 1897 - stock illustration

Colorful courtship plumage of various birds (sexual dimorphism): 1) Horned bell bird (Chasmorhynchus carunculatus); 2) Bluethroat (Luscinia svecica); 3) Pin-tailed whydah (Vidua macroura); 4) Eurasian teal (Anas crecca); 5) Ruff (Philomachus pugnax); 6) Greater painted-snipe (Rostratula benghalensis, female); 7) Greater prairie chicken (Tympanuchus cupido, male); 8) Crested Auklet (Aethia cristatella); 9) Great crested grebe (Podiceps cristatus); 10) Temminck's tragopan (Tragopan temminckii with inflated throat bag). a = Courtship plumage of the male, b = ordinary plumage of the male. Chromolithograph, published in 1897.