It is believed that Sarcosuchus's diet probably contained a little bit of everything. What made these creatures unique was that when they were younger, their snouts were often elongated and narrower, and as they grew older, the snout became flatter, which might have allowed them to eat bigger prey, such as dinosaurs. Scientists hypothesize that the Sarcosuchus probably ate fish in the rivers when it was younger, and as it got to be an adult, its diet would expand to whatever it could get in its mouth, according to Science Focus.
Scientists struggle with fully understanding the Sarcosuchus due to the fact that there is no living descendant of the beast. No other animal has such a unique snout, and on top of that, there are no ball-and-socket joints in this creature like in other crocodiles. But these aren't the only fundamental differences between the Sarcosuchus and its modern-day cousins; things such as age and growth were also very unique to the "super croc" (via Prehistoric Wildlife).
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