From Nonhuman Rights Project:
First Time in World History Judge Recognizes Two Chimpanzees as Legal Persons, Grants them Writ of Habeas Corpus
April 20, 2015 – New York, NY – For the first time in history a judge has granted an order to show cause and writ of habeas corpus on behalf of a nonhuman animal. This afternoon, in a case brought by the Nonhuman Rights Project (NhRP), Manhattan Supreme Court Justice Barbara Jaffe issued an order to show cause and writ of habeas corpus on behalf of two chimpanzees, Hercules and Leo, who are being used for biomedical experimentation at Stony Brook University on Long Island, New York.
Under the law of New York State, only a “legal person” may have an order to show cause and writ of habeas corpus issued in his or her behalf. The Court has therefore implicitly determined that Hercules and Leo are “persons.”
A common law writ of habeas corpus involves a two-step process. First, a Justice issues the order to show cause and a writ of habeas corpus, which the Nonhuman Rights Project then serves on Stony Brook University. The writ requires Stony Brook University, represented by the Attorney General of New York, to appear in court and provide a legally sufficient reason for detaining Hercules and Leo. The Court has scheduled that hearing for May 6, 2015, though it may be moved to a later day in May.