When people think of Polish chickens, they think of those elaborate, beautiful crests. Most people don't realize that Polish chickens also have “vaulted skulls.” Vaulted skulls are misshapen, with a large knob or vault sticking up from the top. A misshapen skull results in a misshapen, unusual, “hourglass” shaped brain. Vaulted skulls are often filled with holes. The only thing protecting parts of the chicken’s brain is a bit of skin and some feathers. Thus, chickens with vaulted skulls are vulnerable to brain damage. What are the genetics behind crests and vaulted skulls? And are these two traits connected?
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