American Museum of Natural Ilistory. 
MOURNING DOVE (Zenaidura macroura). Length: 1 foot. 
Range: North America. 
Mourning doves are tame, gentle birds and will 
breed near human habitations in gardens and shrubbery, 
feeding with poultry. 
Ralph De Sola, Federal Writers' Project. 
DOMESTIC PIGEONS (Columba 
LIVIa). Length: 1 foot. 
Fan-tailed and swallow pig¬ 
eons result from the interbreeding 
of common pigeons displaying a 
tendency towards these unusual 
characteristics. Darwin drew upon 
these interbreeds in evolving his 
evolutionary theories. 
