Most people are aware of what the word extinction means but fewer people are aware of what the term functional extinction means. Functional extinction is a very confusing term as it essentially has 3 meanings.
Functional extinction is the extinction of a species or other taxon such that:

1. It disappears from the fossil record, or historic reports of its existence cease.

2. The reduced population no longer plays a significant role in ecosystem function.

3. The population is no longer viable. There are no individuals able to reproduce, or the small population of breeding individuals will not be able to sustain itself due to inbreeding depression and genetic drift, which leads to a loss of fitness.

In today's video i will be going through just a few animals that are functionally extinct as i will be going through 3 animals that are functionally extinct in their native habitat.

Chapters
0:00 Introduction
1:00 South China Tiger
3:24 Reef Sharks
5:16 Panamanian Golden Frog

Attributions

Ivory billed woodpecker footage:
Texas Parks and Wildlife
   / @texasparksandwildlife  

Panamanian golden frog footage:
Brian Gratwicke
https://www.flickr.com/photos/briangr...
CC BY 2.0 DEED
Denver Zoo
   / @denverzooconservationalliance  
Garland McLaurin
https://vimeo.com/13928922
CC BY-NC-ND

Panamanian golden frog images:
Brian Gratwicke
https://www.flickr.com/photos/briangr...
Attribution 2.0 Generic
The Lord of the Allosaurs
https://commons.wikimedia.org/wiki/Fi...
Attribution-ShareAlike 3.0 Unported

Costa Rican variable harlequin toad images:
Brian.gratwicke
https://commons.wikimedia.org/w/index...
Attribution-ShareAlike 3.0 Unported

South China tiger images:
J. Patrick Fischer
https://en.wikipedia.org/wiki/South_C...
Attribution-ShareAlike 3.0 Unported
John C. Caldwell
https://commons.wikimedia.org/wiki/Fi...
Public domain
China's Tiger
https://commons.wikimedia.org/wiki/Fi...
Attribution-ShareAlike 2.5 Generic

South China tiger footage:
China Review Studio
   / @chinareviewstudio9543  
BKK DOC
https://vimeo.com/bkkdoc
CC BY-NC-ND

Sambar deer image:
Gaurika Wijeratne
https://www.flickr.com/photos/gaurika/
CC BY-NC-ND 2.0 DEED

Shark fin fishing and other shark fin footage:
Greenpeace Aotearoa Video
   / @greenpeaceaotearoanz  
PangeaSeed Foundation
https://vimeo.com/pangeaseed
CC BY-NC-SA

Panamanian amphibian species images:
Brian Gratwicke
https://en.wikipedia.org/wiki/Inciliu...
Attribution 2.0 Generic
JurriaanH
https://en.wikipedia.org/wiki/Cochran...
CC BY-SA 3.0 DEED
Marshal Hedin
https://en.wikipedia.org/wiki/Strawbe...
CC BY 2.0 DEED
Frogmana
https://en.wikipedia.org/wiki/Agalych...
CC BY-SA 4.0 DEED
Charles J. Sharp
sharpphotography.co.uk
CC BY-SA 4.0 DEED
Gatomoteado
https://en.wikipedia.org/wiki/Gliding...
CC BY-SA 4.0 DEED
Mauricio Rivera Correa
https://en.wikipedia.org/wiki/Elachis...
Attribution ShareAlike 2.5

Chytridiomycosis images:
Brian Gratwicke
https://www.flickr.com/photos/briangr...

I have edited and adapted some of these clips and images.
Creative commons liceneces: https://creativecommons.org/share-you...

Thanks for watching i hope you enjoyed :)

Sources:
https://en.wikipedia.org/wiki/Functio...
https://en.wikipedia.org/wiki/South_C...
https://bmcbiol.biomedcentral.com/art....
https://endangeredtigers.org/tiger-sp...
https://www.science.org/content/artic...
https://www.bbc.co.uk/news/newsbeat-5...
https://en.wikipedia.org/wiki/Panaman...
https://www.theguardian.com/environme...