In 1935 he was chosen by Lieutenant-Governor Hubert Murray to lead an expedition into the unexplored Great Papuan Plateau between the Strickland and Purari Rivers, with Louis James O'Malley as his second-in-command, along with 10 police and 28 carriers.
However, it is now believed that explorer Jack Hides discovered the bird, while Mayer became interested in it later.
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