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An ecosystem passes

Cook and those who came after him gave cattle, goats, and large European pigs as gifts to the Hawaiian chiefs, and the animals overran the islands. They ate everything. Rainwater sluiced off the now-bare hillsides without replenishing the aquifers. Areas that had been blessed with an abundance of water suffered drought now. Native plants could not reestablish themselves because the unrestrained animals ate them as soon as they sent up a shoot. People wrongly concluded that native plants were inherently unable to reestablish themselves, and they imported non-native trees like the eucalyptuses and ironwoods that you see so often today.

The native habitat area and diversity shrank still more before the new sugar plantations. Planters drained wetlands for the commercially valuable crop and erected dams, ditches, and sluices to divert the natural water supply into a controllable water supply. What they did was not so very different from what the Polynesians had done when they had cleared the native lowland forests in order to plant their taro, but the scale was far vaster. In one particularly terrible mistake, growers imported the mongoose to prey on the rats that damaged their crops. But the rat forages at night, while the mongoose hunts by day: they seldom met. What the mongooses preyed on instead were the eggs of native ground-nesting birds.