Birdly

Truth for the bird his eye discerns; By birdly hope his wing is strong; And full delight in birdly good; Makes utterance for itself in song.

"Nay, nay," quoth Luxury, "I laugh at thee, — Thou art the king of beasts and I of birds ; Men are of beastly and of birdly kind, But more are birdly and obedience show Only to me, for in their bosom nursed Caprice and Vanity which are my slaves [...]

And in the birdly mind (actually in the birdly gonads), spring begins on their winter grounds with the increasing sunlight, as early as February.