There are 9 on show and no captive bred Telfair's have ever been returned to Round Island, the recovery of the population there was down to habitat restoration and clearance of invasive species
When we first released Telfair’s skinks on Ile aux Aigrettes in 2006/07 it caused substantial declines in the certain populations of invasive species, such as the introduced musk shrew. However, we suspect that shrews, which cannot be eradicated from the island using the techniques that we have used to remove the rats, are eating the eggs of the skinks and preventing the skink population from growing. The release of additional skinks onto Ile aux Aigrettes has raised the population above 600 individuals. We predict that this number of skinks will cause a severe decline and possibly the eradication of the shrew from the island and allow the skink’s eggs to survive and the population to grow.
It's one of my favourite examples, nature knows how to rebalance itself and sometimes, just sometimes, it can manage it with a smidgeon of help!
The Telfairs and Indian Musk Shrews reached a bit of a stalemate, once this happened and numbers had been monitored for a while, the guys out there were able to calculate exactly how many telfairs they should have translocated to an island that size with the population density of shrews that it had! A potential model for many of the other offshore islets of Mauritius.
The adult skinks predate the shrews at all ages, telfairs can be ridiculously voracious and persistent! The shrews were affecting the telfairs recruitment by sniffing out and eating their eggs rather than affecting the adult population.