Gladiator II surpassed its predecessor in sheer spectacle, but in doing so surprised moviegoers with the level of CGI used, and some of the most distracting bits related to the animals involved in the arena. As the now-adult Lucius Verus fights his way across several locations in the Roman Empire, he finds himself embroiled in a number of different types of gladiatorial combat. Lucius participates in everything from a naval battle in the Colosseum to a mini-battle against a band of deadly baboons, all of which require copious CGI to properly depict on the big screen.

https://screenrant.com/gladiator-2-movie-sharks-monkeys-cgi-problem/