Birbs

    [tob]    I am getting more interested in birds. How do they work?
    [thrig]  they are, by and large, unemployed
    [tob]    JOBLESS.

One may on occasion observe crows taking turns hopping up to the ridge of a building, and launching themselves into the updraft caused by the wind pushing against the angle of the roof. The crows would hover for a moment or two, then swoop back down to the roof for another turn. This activity is woefully uneconomic.

Other brids engage in song, without any sort of payment, payolla, or music label involved. What a waste!