Are captive animals really that wild? If they are used to people, can be trained and even breed with people watching, are they really as wild as we think they are? And if not, is there really any chance that they could one day be released to the wild?

REFERENCES
African Lion at Zoo Knoxville by Zoo Knoxville https://vimeo.com/374239786 CC by 3.0
Bright orange baby arrives at Zoo Knoxville for Silvered leaf langur family by Zoo Knoxville. https://vimeo.com/492527157 CC by 3.0
California Condor Release Overview by USFWS Pacific Southwest Region. https://flickr.com/photos/usfws_pacif... CC by 2.0
Drovers rest their horses and dogs by Archives New Zealand. https://www.flickr.com/photos/archive... CC by 2.0
Getting Red Wolves ready for the wild.mp4 by Zoo Knoxville. https://vimeo.com/750435445 CC by 3.0
LA PRÉHISTOIRE by patrick janicek, https://www.flickr.com/photos/marsupi... CC by 2.0.
Lascaux IV by Simone Ramella. https://www.flickr.com/photos/ramella... CC by 2.0
Lion Love match by Zoo Knowville. https://vimeo.com/552517986 CC by 3.0
Startled Silver Fox by Zoofanatic. https://flickr.com/photos/zoofanatic/... CC by 2.0.
Zoo Knoxville Stay Cool b roll by Zoo Knoxville https://vimeo.com/849138810 CC by 3.0
Zookeeper Appreciation Day by Zoo Knoxville https://vimeo.com/847419167 CC by 3.0

Additional Footage filmed at Hertfordshire Zoo