In 2011, conservationists dropped 75 tonnes of poisoned bait on Henderson Island; only about 60–80 rats survived, but within two years their population was back to roughly two-thirds of its former level

Conservationists attempted a large-scale rat eradication on Henderson Island in 2011. About seventy-five tonnes of poisoned bait were spread across the remote South Pacific island. However, a small number of rats survived the intensive campaign. Within two years, the rat population had recovered significantly to former levels. This event underscores the difficulty of achieving complete eradication and the resilience of invasive species.
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