Mildred Dunnock of roles in Broadway productions during the 1930s, Dunnock won praise for her performance as a Welsh school teacher in "The Corn is Green" in 1940. The 1945 film version marked her screen debut. During the 1940s she performed mainly on stage, in such dramas as "Another Part of the Forest" (1946) and "Death of a Salesman" (1949) and in the musical "Lute Song" (1946). In 1947, Dunnock became a founding member of the Actors Studio. Dunnock reprised her "Salesman" role in the 1951 film version. She originated the role of Big Mama in the Tennessee Williams' "Cat on a
Preening (bird) preening. The conflict between two incompatible drives, such as incubating and escape, can also lead a bird to engage in displacement activities. Nesting Sandwich and common terns preen when they have been alarmed by a potential predator or when they have had an aggressive encounter with a neighboring bird, for instance. Fighting European starlings will break off their battles to preen. Although preening is primarily an individual behaviour, some species indulge in allopreening, with one individual preening another. It is not particularly common among birds, though species from at least 43 families are known to engage in the mutual activity.