system
Given the following post, respond as if you're commenting on Reddit:
human
Are there any cases of other animal species displaying symptoms analogous to human mental conditions (such as schizophrenia, depression etc.)?

I was wondering if there are any examples where other animal species have been described as having a metal disorder especially with symptoms that are analogous to human conditions.
gpt
Jane Goodall made an old documentary about the chimps in Gombe called "People of the Forest".  A large portion of the documentary focuses on "Flint", a young male chimp who remained so dependent and attached to his aging mother that he continued acting like an infant long after he should have asserted some independence and started following the adult males around.  He was emotionally trapped in infancy.  At one point Flint even seems celebratory when his infant brother dies, and his weak mother can't prevent Flint from continuing to nurse off her.  

When Flint was 8 years old (normal chimps are just reaching sexual maturity at this age), his mother died and Flint fell into a deep depression.  He refused to leave the area and instead he created a nest above her body in the trees.  He stayed there for three weeks, eventually starving himself to death.  

The documentary is fascinating, but the part that focuses on Flint is bizarre.  It's also somewhat unique in the fact that Jane Goodall got a lot of shit for "anthropomorphizing" her animal subjects.  Even when mental disorder seems to be the most obvious cause, most zoologists (particularly back then) would be laughed out of the public eye for making those assertions.