The team increased the annual output of Old Blue (and later other females) by removing the first clutch over every year and placing the eggs in the nest of the Chatham race of the Tomtit, a technique known as cross-fostering.
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They were saved from extinction by Don Merton and his Wildlife Service team, and by "Old Blue", the last remaining fertile female.
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Several endemic Chatham Island bird species have since been reintroduced to the island, Chatham Snipe in 1970, Black Robin in 1976, Chatham Tomtit in 1987 and Shore Plover in the 1990s.