I could see the argument if the monkey were a 9 year-old child, the child might not fully grasp these concepts today, but you could anticipate a point where the child would understand. Much like child actor laws protecting their earnings.
I could see the wikipedia logic if there was some expectation that copyright would eventually matter to the monkey.
Forget that the monkey is an organic being... If the camera were shot up in the air in a rocket and had a pressure switch to take a series of photos at 5,000 feet (or maybe more directly at some random altitude or point in travel), who would "own" the photos? The rocket? Or the person who put the events together to capture those images in that manner.