Albert Barnes Commentary Psalms 104:22

"The sun ariseth, they get them away, And lay them down in their dens." — Psalms 104:22 (ASV)

The sun arises - A new scene in this endless variety of incidents in a world full of life and beauty. The psalmist sees the light break in the east, and the sun appear above the horizon - and the whole scene is changed. The animals that had gone out at night are seen to return to their hiding-places, and man in his turn (Psalms 104:23) is seen to go out to his daily toil.

They gather together - Though scattered in the night, when light returns, they all make their way to the places where they usually rest in the daytime. The scene is most beautiful. At night they venture out for their prey; when the morning light returns, they all retrace their steps to the dens and caverns where they pass the day, and there they rest in silence until night returns.