. Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets. Nature study. Pigeon houses of the upper Nile* Photo by J. H. Comstock. PIGEONS Teacher's Story HERE is a mention of domesticated pigeons by writers three thousand years ago; and Pliny relates that the Romans were fervent pigeon fanciers at the beginning of the Christian era. All of our domestic varieties of pigeons have been developed from the Rock pigeon, a wild species common in Europe and Asia. The carrier pigeon was probably the first to be specially developed because of its usefulness; its lo