A few places compete for warm trees early. Who pecks at spring mud, what bird?

Orioles, swallows. From Bai Juyi's Spring Tour in Qiantang in the Tang Dynasty, several early warblers compete for warm trees, and new swallows peck at spring mud. A few early orioles scrambled to fly to the sunny tree, and the new swallows were busy building nests and holding mud. Looking up, I saw birds singing, warblers singing and swallow dancing, which showed the vitality of spring, outlined the poet's mood of seeking sound, showed the poet's delicate psychological activities, and made readers have rich associations.