格雷戈里再次引用之前的研究提到说，“这样的损伤结果可能是由于禽类在温暖的季节生长的皮肤很松弛所致。”
The effect is probably due to weaker skin in birds grown during the warmer season.
上层皮肤逐渐磨损脱落掉，新的皮肤层在下层皮肤里又生长出来。
Top layers of skin get worn away. New layers grow underneath.
上层皮肤逐渐磨损脱落掉，新的皮肤层在下层皮肤里又生长出来。
Top layers of skin get worn away. New layers grow underneath.
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