Interesting/Little Known introduced populations

There was a population of Cattle Egrets on Easter Island from at least the 2000s to some time in the 2010s, but very little is known about it. According to Thibault & Cibois (2017), it is not even known whether the species was introduced to Easter Island, or colonised Easter Island by itself.
This blog post says what the fate of the population was:
Cattle Egret (Bubulcus ibis) lived in groups, but their population was controlled after an accident at the airport. They say there is still one individual living in the nearby islets.
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Cassidy Casuar said:
I've noticed that all eBird reports of the Warbling White-eye in California have been deleted?

Edit: My bad; the species is actually the Swinhoe's White-eye.
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Yes, I made that post before Clement's had split them. The California birds are Swinhoe's White-Eye now.
 
On eBird, it's interesting to see how widespread the Spotted Dove used to be in California; some were even seen in northwest Mexico. Now the only place left in California where one is likely to see a Spotted Dove is the southeast corner of Santa Catalina Island.
This appears to be similar to the rise and fall of the Crested Myna population in Vancouver.
 
On the Boso Peninsula in Japan there seems to be an introduced Rhesus monkey population. They form a real danger for the Japanese macaque with which they seen to hybrinate....
 
An escaped Greater Rhea was seen in Britain. It will probably be returned to its owner.
I know that this doesn't refer to a population, but I don't think that the subject warrants its own thread.
The Greater Rhea cannot grow to be six feet tall, though, and it certainly isn't strong enough to disembowel a human!
 
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Cassidy Casuar said:
An escaped Greater Rhea was seen in Britain. It will probably be returned to its owner.
I know that this doesn't refer to a population, but I don't think that the subject warrants its own thread.
The Greater Rhea cannot grow to be six feet tall, though, and it certainly isn't strong enough to disembowel a human!
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Yeah, the sizing is a bit overblown! Though at the end of the article where it gives some rhea facts it actually contradicts itself! :p

Could a population of rhea establish in Britain?
 
This doesn't refer to a population, but the Elegant Quail has been reported from extreme southern Arizona. Apparently all reports of the species from Arizona so far have been dismissed as referring to escapees, despite the fact that the species' range in Mexico suggests that it could occur in Arizona naturally. (1) (2) (3)
 
Cassidy Casuar said:
This doesn't refer to a population, but the Elegant Quail has been reported from extreme southern Arizona. Apparently all reports of the species from Arizona so far have been dismissed as referring to escapees, despite the fact that the species' range in Mexico suggests that it could occur in Arizona naturally. (1) (2) (3)
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I've never heard of Elegant Quail in a US zoo, are they common in the private trade?
 
Does anyone here know whether the Common Bulbul is considered to be native or non-native to Tarifa, Spain?
 
Great Argus said:
Hbw seems to consider them a native.
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The authors should consider the possibility that the Common Bulbul population in Tarifa is derived from ship-assisted specimens. The Red-vented Bulbul is in the same genus, and that species is notorious for being able to expand its distribution in the islands of the Pacific by stowing away on ships.
 
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