“Uro-genital organs of male embryo bird; from Owen, after Muller. a, kidneys: b, ureters; c, wolffian bodies; d, their ducts, to be sperm-ducts; e, genital glands, to become testicles; f, adrenals.” Elliot Coues, 1884
Elliot Coues Key to North American Birds (Boston, MA: Estes and Lauriat, 1884)
1323×2400, 1.2 MiB
564×1024, 168.8 KiB
352×640, 86.3 KiB
176×320, 28.0 KiB