Yes PETA is claiming that since the monkey took the selfies that PETA should become the administrator of the income generated by the selling of the selfies—they appeared in Slater’s book, and at many online sources—so they can care for the monkey and others.
And he has offered to sell copies of one of the "monkey selfies" and will donate $1.70 per order to a conservation project dedicated to protecting Sulawesi's macaques. But he also wants some of the money from the sales for his daughter:
Seriously, PETA, aren’t there bigger fish to fry? Perhaps a lawsuit, or even a request, that Slater donate some of the proceeds from his book to a conservation project in Sulawesi might have made you look better and less like a monkey with a camera.