Planet Wild - Mission 17
- https://ocean.si.edu/ocean-life/sharks-rays/sharks
- http://archive.maltatoday.com.mt/2009/05/31/t12.html
- https://www.theguardian.com/environment/2021/jan/27/sharks-rays-global-population-crashed-study
- https://www.nhm.ac.uk/discover/do-sharks-lay-eggs.html