“The developing chicken in the egg first appears in written history after catching the attention of the famous Greek philosopher, Aristotle, around 350 BCE. As Aristotle opened chicken eggs at various time points of incubation, he noted how the organism changed over time. Through his writing of Historia Animalium, he introduced some of the earliest studies of embryology based on his observations of the chicken in the egg.
Aristotle recognised significant similarities between human and chicken development. From his studies of the developing chick, he was able to correctly decipher the role of the placenta and umbilical cord in the human.”
(Source: Wikipedia contributors. “Chicken as biological research model.” Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 26 Apr. 2016. Web. 6 Apr. 2017.)