Card stock (white or black is ideal, but any colour is fine), cotton wool, glue, scissors and a pen.
纸板(最好是黑色或者白色的，别的颜色也可以)，棉花，胶水，剪刀和笔。
The first group had their plumage colour enhanced with a marker pen.
第一组鸟的羽毛被用彩笔加强了色彩。
The first group had their plumage colour enhanced with a marker pen.
第一组鸟的羽毛被用彩笔加强了色彩。
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