Here's the breakdown:
* They can be quite variable: Orangutans actually have a range of colors from reddish-brown to blonde!
* It's all about the pigment: Their color is determined by the amount of pheomelanin in their fur. This is the same pigment that gives humans red hair.
* Sunlight and diet play a role: Their color can change over time due to exposure to sunlight and their diet, which is primarily fruit.
* Not all are orange: The "orangutan" stereotype of being bright orange is mostly due to the famous Sumatran orangutan, which tends to have a more vibrant hue compared to their Bornean counterparts.
So, while the "orange" part of their name is a bit of an exaggeration, their variety of colors makes them even more fascinating!