Fur used to one of the great computer graphics no-nos: a substance, alongside grass and water, that was so computationally expensive to render that it tended to be avoided at all costs, even at the script stage. There is a reason why so many kids' TV shows of a certain vintage all depict smooth skinned aliens on small, arid moons...
That this sort of thing is not much of a consideration anymore (at least if you're ILM) is obvious when you look at the effects breakdown below for Skull Island and realise one of the ILM artists working on the project actually goes by the title of Lead Fur Groomer.
"The director didn't want a typical fur groom, so we knew that the fur would never be clean," says the artist in question, Gaelle Morand. "It required an insane amount of detail. We ended up incorporating a lot of clumping, we also added very large matted sections into our groom. We knew that we needed to dirty it up, so we added leaves, we added twigs, we added mud, and secondary grooms included the injuries sustained by Kong during the film."
The detail is extraordinary. Have a look below.