Catullus 2

Catullus once again dwells on the small details of his lady to satisfy his infatuation with her. In Catullus 51, he was jealous of the man who sat beside her; now he is jealous of her sparrow. He dwells extensively on the relationship the lady (most likely Lesbia) has with her sparrow.
This is yet another way that Catullus describes the qualities of his lady. She is quaint and charming, a girl who men are attracted to because of her lovable demeanor. He also hints that she is only playing with her sparrow to take her mind off of her own past lover. Whatever has happened between them, Lesbia is now looking for "some small relief from her pain." Catullus claims that she makes the sparrow peck her so as to forget her deeper, more agonizing pain - that of love.
However, Catullus is once again a cowardly figure in this poem. He does not approach Lesbia; he just watches her from afar. For whatever reason, Catullus cannot approach Lesbia. Even though he asserts that he would give the world to play with her as she plays with the sparrow, he cannot find the courage to even speak to her. He wants her to "ligthen the gloomy cares of [his] heart," yet he is most likely observing this scene from behind a far-off wall.

Creeper.