The SPCA is calling on the public to help stop whoever is attaching Christmas decorations to Wellington's birds.

Dozens of birds have died after being decorated with tinsel and other Christmas paraphernalia.

The Society for the Prevention of Cruelty to Animals (SPCA) is calling on the public to help solve the act of "cruelty" that has been particularly bad in the Wellington suburb of Kilbirnie.

Members of the public have reported sightings of non-native birds with tinsel wrapped around their bodies, as well as items such as Anzac poppies and ribbons.

SPCA/SUPPLIED A bird decorated with trinkets, spotted in the Wellington suburb of Kilbirnie.

Some of the birds have also had strips of metal ribbon wrapped around their legs.

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The incidents began in 2017 but increased last year, in particular across the Christmas and New Year period.

SPCA/SUPPLIED This sparrow had tinsel wrapped so tightly around its wing that its circulation was cut off and it died at the Wellington SPCA.

SPCA Central Region general manager Ros Alsford said the animals brought into the Wellington SPCA branch were either at the point of starvation, or dead.

The wild animals spotted wearing the trinkets become severely stressed and further entangled in the items as they tried to pry them off their bodies with their beaks, she said.

Unfortunately, those that had survived were in such a poor state that they were euthanised.

The incidences had been isolated to the capital, but had become so frequent it had forced a public call-out by the SPCA,

"It's got to a point that we've had to do something. We've seen so many come in over the last couple of weeks so we're trying to get to the bottom of this unusual behaviour and trying to find person responsible," Alsford said.

"It's certainly a number that is making us sit up and go, 'What's going on?'."

JOHN NICHOLSON/STUFF SPCA Central Region general manager Ros Alsford said the public has been asked to help track whoever is behind wrapping decorations around Wellington birds.

While the birds brought to the SPCA's attention were non-natives, Alsford said that did not mean natives weren't being targeted.

"The last one, the bird was severely underweight due to starvation. The tinsel was wrapped so tight it cut the circulation off around its wing," she said.

"Naturally we want some help to identify the person doing this so we can educate, get to the bottom of this and prevent further distress and suffering of these animals."

Salek and Te Whiti streets in Kilbirnie are where most of the birds were reported to be seen in distress.

Anyone with information can contact the SPCA 's Wellington centre on (04) 389 8044.