In Mary Roach's book "Stiff: The Curious Lives of Human Cadavers," the author discusses the complexities of drawing comparisons between human anatomy and that of chickens, particularly in relation to the study of decay and biological processes. The analogy that compares humans to hen's eggs is criticized as flawed because it does not take into account the significant differences that exist between species.

Roach emphasizes that while such comparisons can provide insights, they are ultimately limited by the unique characteristics inherent to humans. The nuanced exploration of cadaver studies reveals deeper truths about mortality and the human condition, making the reliance on simplistic analogies problematic in understanding our own biology.