greater coverts 中文意思是什麼
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It is a very big generalization, and some species are exceptions, but generally first summer individuals can only be separated by retained juvenile remiges and rectrices or by moult limits in the greater coverts
這是一個很概括的看法，且某些鳥種是例外，但一般而言一齡夏羽個體只能以還留著的幼鳥飛羽和尾羽，或大覆羽的換羽界限來區分 -
First warbler yellow - browed, the dark bases to the secondaries and black - centred greater coverts leave few other options
第一隻是黃眉柳鶯，次級飛羽暗色的基部及以黑色為中心的大覆羽留下的選擇很少
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