Now, Slater is apparently struggling financially, the costs of the ongoing court battles all but draining his coffers.
Speaking to The Telegraph, the 52-year-old photographer said: "I'm just not motivated to go out and take photos any more".
People for the Ethical Treatment of Animals (PETA) sued Mr Slater over the photo in 2015.
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The selfie in question occurred in 2011 when Mr Slater was travelling to Indonesia to take photos of macaques. PETA then filed a lawsuit against Slater on the monkey's behalf to have the copyright assigned to the monkey.
"Every photographer dreams of a photograph like this".
"I know for a fact that [the monkey in the photograph] is a female and it's the wrong age", Slater tells The Guardian. "I'm bewildered at the American court system. I don't make enough money to pay income tax".
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