Photograph of a cock sparrow in bridal period: it's not obvious in the sparrows, but we can distinguish a gray band on the top from the head. It was bringing back a small larva to its small.
During Estuary Festival 2009, Celeste Boursier-Mougenot (Nantes France) has installed an aviary in which were exposed guitars. The name of his work: "From here to ear." By walking on the instruments, birds create random pieces.
This bird, with his blade of grass, seemed to change the strings of his guitar. :-)