Humans are not so good, though, for the mangrove finches who have been all but wiped out by the accidental introduction of a parasitic fly.

Other early samples of iron may have been produced by accidental introduction of iron ore in bronze smelting operations.

The most recent shift in the fish population followed the accidental introduction of common carp in 2001.

Another method of accidental introduction occurs through the movement of machinery and equipment.

Some of these, notably discus, are the result of accidental introductions that happened in the 1970s.