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· collected 2026-08-18 · by TOI World Desk
In 1867, the Canterbury Acclimatisation Society released 40 house sparrows in New Zealand to control agricultural pests, but within 15 years, they had become a problem themselves by damaging crops. The bird's ability to breed rapidly and switch from eating insects to grains and fruit made them difficult to control, leading to efforts to eradicate them. According to government encyclopedia Teara, the introduction of house sparrows was part of a larger effort to introduce European birds to New Zealand, with 41 species eventually establishing wild populations out of 130 introduced. By the early 1880s, native birds were having little impact on farmland pest populations due to habitat loss and competition from invasive species.
Written by the local model on 2026-08-18,
using this article's own text rather than the other coverage of the
same event (that is the story summary below).
The house sparrow was brought to New Zealand in 1867 to help farmers deal with crop-eating insects, but the small bird soon became a problem of its own.
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bird → bring → own
Within a few years, while it grew in numbers, it also began damaging crops, leading farmers and authorities to turn against the species.
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it → grow → species
Introduce familiar European birds to New Zealand was not uncommon.
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Introduce → introduce → Zealand
According to government encyclopedia Teara, European settlers brought many bird species to the country.
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settlers → accord → country
Both because they missed the birds they knew from Britain and because they hoped some of them would help agriculture.
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some → miss → agriculture
In all, 130 bird species were brought to New Zealand, with 41 eventually establishing wild populations.
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41 → bring → populations
The Canterbury Acclimatisation Society liberated 40 sparrows in 1867.
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Society → liberate → 1867
The birds were expected to help control agricultural pests, particularly insects that were damaging crops.
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that → expect → crops
But sparrows did not remain focused on insects.
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sparrows → remain → insects
While they fed their young on caterpillars, beetles, flies and spiders during their first week after hatching, they were more interested in grains and fruit at other times.
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they → feed → times
That made the bird a serious concern for farmers.
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bird → make → farmers
Sparrows damaged wheat, barley and maize crops, and their ability to breed rapidly meant their numbers could rise quickly.
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numbers → damage → crops
The same qualities that made them attractive as a possible pest-control species eventually made them difficult to control.
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them → make → species
The introduction of birds gathered pace as farming expanded across New Zealand.
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farming → gather → Zealand
By the early 1850s, moths, caterpillars, beetles and grasshoppers had become major problems in agricultural areas.
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moths → become → areas
Some insect outbreaks were so large that they disrupted normal activity.
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they → disrupt → activity
Native birds did eat insects, but their ability to control pests in farmland was limited.
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ability → eat → farmland
They generally foraged in agricultural areas when nearby bush provided suitable habitat.
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bush → forage → habitat
As more land was cleared for farming, the bush edge was pushed back and native birds had even less influence on farmland pest populations.
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birds → clear → populations
Farmers therefore looked towards birds from Europe.
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Farmers → look → Europe
Species such as blackbirds, thrushes, starlings, sparrows and magpies were introduced in the hope that they would eat insects and reduce crop damage.
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they → introduce → damage
From the 1860s, acclimatisation societies began organising these introductions more systematically.
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societies → begin → introductions
They selected birds partly for their ability to survive in New Zealand and reproduce in large numbers.
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They → select → numbers
Some societies also wanted birds that could eat insects during summer but switch to other food, such as seeds or grain, during winter.
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that → want → winter
Sparrows' rapid rise led to organised efforts to control them.
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rise → lead → them
The sparrow boom
As few as 100 house sparrows were liberated in New Zealand between 1866 and 1871, while the Canterbury Acclimatisation Society released 40 in 1867.
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Society → liberate → 1867
Te Ara says this was probably helped by abundant food, little competition, a mild climate and few predators at the time.
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this → say → time
Early observers noticed that female sparrows could lay another clutch of eggs while their previous young were still in the nest.
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young → notice → nest
The young birds apparently helped incubate the eggs.
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birds → help → eggs
Naturalist Thomas Kirk highlighted the potential scale of this growth in 1878.
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Kirk → highlight → 1878
He calculated that one pair of house sparrows could theoretically produce a population of 322,000 within five years.
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pair → calculate → years
A new pest emerges
The introduction of the house sparrow was intended to reduce insect pests, but the birds themselves began to be seen as a threat to agriculture.
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birds → emerge → agriculture
The problem was not limited to sparrows, however.
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problem → limit → sparrows
Other introduced small birds also multiplied and damaged crops.
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birds → introduce → crops
Sparrow clubs were formed in the 1880s to reduce what was described as the 'sparrow plague'.
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what → form → plague
The clubs were modelled on similar organisations established in England from the 1850s.
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clubs → model → 1850s
The methods included poisoned grain, shooting and financial rewards for collecting sparrow eggs.
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methods → include → eggs
Bounties were also offered for eggs and heads of small introduced birds.
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Bounties → offer → birds
The system encouraged children to collect sparrow eggs, with small boys gathering hundreds of thousands of them.
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boys → encourage → them
