两只鸟都长着深蓝色的羽冠。

Both birds had a dark blue crest.

《柯林斯英汉双解大词典》

“实际上，”天鹅回答说，“我曾经也这么想，直到我遇到一只鹦鹉。它是鲜艳的红色和蓝色。没有比鹦鹉更幸福的鸟了。“

"Actually," the swan replied, "I thought so, too, until I met a parrot. It had brilliant colours of red and blue. No other bird could be happier than the parrot."

youdao

当伯劳鸟出现时，亮蓝色的雄性壮丽细尾鹩莺面对危险不会逃离，而是发出一种特有的鸣叫。

Bright blue male splendid fairy-wrens, instead of fleeing in the face of danger, sing a distinctive song when a butcherbird is in the area.

youdao