It's much more of the box office than biology, but from Cujo onwards the needs of story outweigh any requirement for accuracy.
Roberts has cited Cujo as major inspiration, and just as many dog lovers found that Stephen King adaptation emotionally distressing, chimp sympathizers will likely flinch at this grisly bout of monkey madness.
…similar to the way we look at the rabid canine in Cujo…
When Primate hits its stride, it channels the sweaty, heart-pounding energy of Cujo or The Birds, but with a glossy modern sheen.
The whole idea of being "trapped" may have worked well in the context of "Cujo," where a mother and her young son are stuck in a car while a rabid dog lurks about, but here it merely makes a ridiculous situation even more silly…
There are several parallels with Stephen King’s story Cujo, which also featured a rabid animal as the antagonist.