I have an idea the South Georgia Reindeer have been eradicated in the interests of indigenous fauna and vegetation.
Interesting/Little Known introduced populations
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They have been eradicated just as the mice and rats.
Long-spine sea-urchin in the Mediterranean Sea :
Needle in a haystack—genetic evidence confirms the expansion of the alien echinoid Diadema setosum (Echinoidea: Diadematidae) to the Mediterranean coast of Israel | BRONSTEIN | Zootaxa
Needle in a haystack—genetic evidence confirms the expansion of the alien echinoid Diadema setosum (Echinoidea: Diadematidae) to the Mediterranean coast of Israel | BRONSTEIN | Zootaxa
Red-vented Bulbul or Red-cheeked? I know Red-cheeked is present, hadn't heard of Red-vented here yet. And where are the Great Tits established? That's a new one to me, didn't know any of the Old World tits were established here.
Red-vented Bulbuls have a quickly growing introduced population in the Houston area.
Great Tits may be found along the coast of Lake Michigan in my home state of Wisconsin. I should know - I've seen them.
Interesting, how much of a population do they have? Are they all escapes/releases or is breeding occurring, do you know? Guessing they're a more recent species to appear?
In 2004, there was an illegal release of several species of European songbirds in North America. 8 species were released, but only the Great Tit and European Goldfinch became established. There is confirmed breeding for both of these species. The Great Tit has population in Sheboygan, WI. There have been sightings at Harrington Beach State Park, though there is not a population there. As far as the EU Goldfinches, they are found mainly in Kenosha, WI, especially around The Bird's Nest (a feed manufacturer).
Interesting, thanks for the information! Out of curiosity, do you know what the other six species were?
Eurasian Blue Tit, Eurasian Siskin, European Greenfinch, Common Chaffinch, Eurasian Linnet, and Eurasian Jay.
Also a source would be handy.
Agreed, sources are always very useful when making such claims. I did some digging and found this page: Species Survey Strategy - Recently Introduced European Songbirds - Wisconsin Breeding Bird Atlas, which I suspect might have been the source. Interesting!
Because I mentioned it another thread I thought I'd post it here. Probably one of the most unusual feral populations is the hippo's of Colombia! 
The growing problem of Pablo Escobar’s hippos
The growing problem of Pablo Escobar’s hippos
That, along with data from eBird and the Wisconsin Bird Breeding Atlas II are my sources.
Haven't seen any further news about their establishment yet, but there are a number of feral warthogs (probably escaped from hunting ranches) living in southern Texas. The most recent link I can find is the one below, from 2016:
What's to Blame for Warthogs Taking Over South Texas?
What's to Blame for Warthogs Taking Over South Texas?
Found a note that Kookaburras have been introduced to New Zealand, anybody some more information about this ?
The kookaburras were probably introduced by Sir George Grey (former prime minister of NZ) a long time ago in Kawau Island. They are rare in the country, with sightings being near Kawau.
Already in 1513 the Chinese ring-necked pheasant was introduced on the island Saint Helena and seem to be still present.
I'm digressing slightly but Sir George Grey was also the Governor of the Cape Colony in South Africa. He donated a number of South African animals, most notably a quagga, to London Zoo.
He was awarded the Silver Medal of the Zoological Society of London for his "numerous donations of South African animals".
Golden mussel in Brazil :
More than two decades after the introduction of Limnoperna fortunei (Dunker 1857) in La Plata Basin
More than two decades after the introduction of Limnoperna fortunei (Dunker 1857) in La Plata Basin
Apparently there are Green Iguanas in Singapore!