This species is Extinct in the wild.
The last sighting in its natural habitat was in 1972. There are probably
less than a hundred in captivity and a reintroduction is planned.
The decline and extinction in the
wild of Z. graysoni has been attributed chiefly to predation by
cats. However, it was thought that cats became feral on Socorro in the
1950s, but this date has now been revised to the early 1970s2.
This suggests that other factors, such as human predation and high levels
of understorey grazing by sheep, may have been significant.
A proposal is currently being
developed to reintroduce the species1. Some control of
feral cats has been undertaken, but there are now plans to eradicate cats
and sheep3. Reports that rats have recently colonised
Socorro have proved to be unfounded2.
*Eradicate cats and sheep from
Socorro. *Reintroduce the species following the completion of this
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