Invasive species can cause extinctions and alter ecosystems. This is why so much effort, time and money is put into trying to control invasive species but in some cases it's a loosing battle. Invasive species are usually very intelligent and hardy and that's often why they're so successful. Some invasive species have become so successful that there is no chance that they will ever be controlled and this is bad news for the native species.
In this video i will be going through just a few of the worst invasive species in the world as i will be going through 3 invasive species that will never be controlled.

Chapters
0:00 Introduction
0:42 Eastern Grey Squirrel In The UK
4:45 Lionfish In The Eastern USA And The Caribbean
8:09 Red Foxes In Australia

Attributions

Red fox images:
caroline legg
https://www.flickr.com/photos/1289412...
(CC BY 2.0)

Eastern gray squirrel images:
Fyn Kynd
https://www.flickr.com/photos/7945212...
(CC BY 2.0)
Watts
https://www.flickr.com/photos/watts_p...
(CC BY 2.0)
Charles J. Sharp
https://www.wikidata.org/wiki/Q54800218
(CC BYSA 4.0)
FWC Fish and Wildlife Research Institute
https://www.flickr.com/photos/myfwc/
(CC BYNCND 2.0)

Red Squirrel images
hedera.baltica
https://www.flickr.com/photos/hedera_...
(CC BYSA 2.0)

European pine marten images:
Zweer de Bruin
https://www.flickr.com/photos/bzd1/
(CC BYNCND 2.0)

Lionfish images:
Jens Petersen (Edit by Olegiwit)
https://commons.wikimedia.org/wiki/Fi...
(CC BYSA 3.0)
KrisMikael Krister
https://www.flickr.com/photos/1488358...
(CC BY 2.0)
Brian Gratwicke
https://www.flickr.com/photos/briangr...
(CC BY 2.0)
Rickard Zerpe
https://www.flickr.com/photos/krokodi...
(CC BY 2.0)

Red fox images:
Ouwesok
https://www.flickr.com/photos/9597500...
(CC BYNC 2.0)

Fox hunting images:
Yale Center for British Art
https://en.wikipedia.org/wiki/en:Yale...
(CC0 1.0)

Thylacine footage:
ABC News (Australia)
   / @abcnewsaustralia  

I have edited and adapted some of these clips and images.
Creative commons licences: https://creativecommons.org/licenses/

Thanks for watching i hope you enjoyed :)