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In Jurassic World, we meet a mosasaurus. We see it again in Jurassic World: Fallen Kingdom.
At the start of the film, it's still in its enclosure. How did it survive all that time? While it was fed daily when the park was operating, and it had an Indominus Rex carcass to feed on, it was left alone for a couple of years.
How did it survive?
In the film Jurassic World we see the mosasaurus jump out of the water to catch a pteranodon as well as beaching itself to catch the i-Rex™.
Presumably it can simply keep doing that whenever it gets hungry. There's apparently no shortage of dinos (both flying and non) left on the island at the end of the film.
Colin Trevorow seems to have confirmed this idea in a podcast interview with Empire Magazine
Empire: The mosasaurus. I have to ask, what has it been eating, because this movie is set like four or five years….
CT: Well, but the opening sequence is set just after, there’s three years that pass. We didn’t put that type up onto the screen but the opening sequence could even be weeks after or a few months after. And then time passes to allow them to create that creature
Empire: I was trying to work out if the mosasaurus was jumping up and eating birds...
CT: Probably some. I think if some nesting pteranadons were on the water and if an animal came down to drink and didn’t realise it was salt-water, they’re in trouble
Jurassic World Fallen Kingdom Spoiler Special ft. J.A. Bayona & Colin Trevorrow
I've raised mega predators and an animal such as the alligator gar can actually go about two and a half years without eating before it will finally die.
I had an animal shelter and individuals that wanted to see it shut down kill the power and many of the animals. Death the alligator gar was one that survived but the trauma of the event was enough that it never ate again I made several attempts over two and a half years and I think it may have consumed once or twice a small meal but essentially went without eating for two and a half years. I have a ball python that refuse to eat for 10 months and then suddenly started to feed again normally. And I've heard of large snakes and crocodilians going over a year for an animal as massive as the mosasaurus I would think that you're probably talking about years pending that nothing exhausted its energy reserves.
