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It is common knowledge that bull sharks are one of the only species of shark to be able to live in both marine and freshwater ecosystems but sometimes it is taken for granted just how amazing this is. Evolveing to transcend both types of ecosystems is already challenging for bony fish to the point that a fraction of their population have the ability and an even smaller percentage of them can do it freely. Bull sharks are not only abkle to freely travel between salt and freshwater multiple times in their lives but there are specific reasons that make sharks even less adaptable to live in freshwater. To support me on Patreon (thank you): https://www.patreon.com/MothLightMedia To donate to my PayPal (thank you): https://www.paypal.me/mothlightmedia To buy merchandise: teespring.com/en-GB/stores/moth-light... Email: mothlightmedia@outlook.com If I have used artwork that belongs to you but have neglected to credit it this will just be because I was unable to find one. If this has happened please contact me and I will add a credit. Some Art work has been altered for the purposes of bettering them for video format; these alterations were done independent from the artists who created the original work, so they are not responsible for any inaccuracies that could have occurred with the changes being made. Sources: https://academic.oup.com/mbe/article/27/11/2576/1121974 https://journals.biologists.com/jeb/article/218/7/1099/14564/Mechanical-challenges-to-freshwater-residency-in https://www.sciencedirect.com/science/article/pii/S000634959877972X https://pubmed.ncbi.nlm.nih.gov/21897086/ https://utmsi.utexas.edu/science-and-the-sea/print-article/a-shark-in-fresh-water/