先前的研究表明，在实施局部麻醉时，红棕色或黄棕色头发的人比其他颜色头发的人更有抗药作用。
Previous research had shown that gingers were more resistant to the effects of local anaesthesia than people with other hair colours.
翼上初级飞羽呈现灰白色，翼前缘经常为淡棕色或黄棕色，比飞羽的深灰色要浅。
Upperwing has pale greyish-white primary bases and often pale rufous or yellowish-brown forewing, paler than dark grey flight-feathers.
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