The wildlife system in RDR2 was amazing. GTA 6's will likely be lighter - intentionally, not due to limitations. Here's why.

Why RDR2 went deep

Western-themed game where wildlife played a huge role in narrative and economy. Hunting animals, skinning them and grading their quality were all gameplay loops. Wildlife was one of the main aspects of the gameplay.

GTA 6 will not be built around that. There will be wildlife, and it will be decent, but it won't be load-bearing in the same way.

What GTA 6 is likely to share

Lifelike animal AI - movement, reactions to danger. Distinct species visible in the wild for each biome. Solid animation work. These are all things players should expect to carry over from RDR2.

Not expected: a complete ecology simulation, deep hunting mechanics, animal-quality systems.