Happy the Asian elephant has been living at the Bronx Zoo for more than 40 years.

She’s 47 years old and has been living alone since 2006, separated from the zoo’s two other elephants ever since a fight led to bad blood.

So is Happy happy? It depends on whom you ask.

The zoo has said many times that Happy is quite content. But an animal rights group has described the situation quite differently, saying that the elephant is being unlawfully imprisoned. So it’s suing the zoo to set Happy free.

The Nonhuman Rights Project is a nonprofit organization that defends “nonhuman animals.” It’s seeking to get Happy — and three other elephants and a handful of chimpanzees — the same legal protections as humans.