Athol Fugard's Boesman and Lena is centered on a "coloured" couple living in South Africa during the era of Apartheid. The play was first performed in South Africa in 1969.
Near the beginning of act 1, we come to a brief moment where the stage directions describe Lena watching and yelling at a bird flying slowly out of her view.
Essentially, Lena does not like birds because she is jealous of them, because they have a freedom that she does not. Birds can fly away, while she and Boesman have to stay on the ground, "in the mud." Lena cannot even choose where to stay on the ground. She and Boesman have to move from place to place, as white men keep bulldozing the shantytowns where homeless "coloured" people live, telling them to "Clear out!" She feels that the place they have come to is "rotten," but for now she has no choice but to stay there.