Black howler monkeys at an Argentinian ecological park have been
suffering depression following the death of two of the oldest females in
the group and had to be given medication because they refused to eat.
Two
alpha females died 1 1/2 years ago from natural causes at the Rio
Cuarto Urban Ecological Park some 650 kilometres (400 miles) west of
Buenos Aires, and from that moment "their male companions began
suffering depression and four let themselves die of sadness," park
director Miriam Rodriguez said. The black howler monkeys in this
12-hectare (30-acre) park "live in a group and are very close to one
another," Rodriguez said.
"When the females died, we noticed the others behaving oddly,
but we thought it might have been something they ate." Concerned
about their lethargy and refusal to eat, park officials consulted
specialists at the nearby Cordoba Zoo, who told them "the animals could
be going through a phase of acute depression," Rodriguez said.
After
several analyses, psychiatrist Sergio Castillo confirmed the diagnosis
of depression and two months ago prescribed a treatment based on
sertraline, "a mineral derived from the serotonin used in humans to
reverse different symptoms originating from compulsive disorders or
depression," veterinarian Ezequiel Carrizo said. There was initially
some resistance to the treatment since it seemed "ridiculous to give
them anti-depression medication even if it was only a minimum dose,"
Rodriguez said, adding that "it has begun to raise the monkeys'
spirits."