Im Jahr 1959 schätzte man, dass die Bevölkerung der Seychellen Warbler, ein endemischer Vogel, nur 26 Tiere umfasste, die alle auf Cousin beschränkt waren.
Soon, an intensive conservation programme was implemented: The coconuts were cut back so that the native forest of Pisionia grandis favoured by the Seychelles Warbler could thrive again. By 1982, the Seychelles Warbler population had reached about 320 adults, the maximum population Cousin could support. From here, the Seychelles Warbler was reintroduced to other islands in Seychelles to increase its population. The bird is now found on five other islands in Seychelles and numbers over 3000 individuals. The bird was reclassified from Red List 'Critically Endangered' to Critically Endangered in 2015 and is one of the biggest conservation success stories of recent times.