A chimp that hid his physical frailty to "show a strong front" has died after fighting with Wellington Zoo's alpha male.
Now the troop is coming to terms with the death of Temba the chimp, and have even been shown his body to allow them to understand he is gone.
Temba, the second in command in the 13-strong troop, never woke up from surgery on his leg after it was torn open by Marty in a fight on Saturday.
Zoo life science manager Paul Horton said the gash, behind his knee and possibly from a bite, was so serious staff decided he needed an urgent operation.
The surgery went well but it was when vets tried to wake him up, Temba's vital signs started to crash, he said.
Vets tried to revive him for about an hour but were eventually forced to euthanise the chimp.
Horton said now the troop were aware of the gap in their ranks, and they were "subdued" after the weekend.
"You can imagine the chimpanzees are very much like you and I. They're incredibly intelligent and their social environment is incredibly important to them."
Staff showed Temba's body to the troop after he was euthanised, so they got "a bit of an understanding of the loss, and that he wasn't with them anymore, before he was taken away".
Horton said Temba had been positioned as "2IC" in the troop for quite a while - providing a good support for Marty.
"We were quite happy to see how he was going, and interested as well to see how he was going politically."
Before Saturday, the zoo was home to a troop of 13 chimpanzees, which was one of the largest in Australasia.
Horton said on Saturday the fight might have been either rough and tumble that got out of hand, or a direct challenge by Temba for the number one spot.
"Because it was Temba there's a chance it was some kind of positioning challenge to Marty. These guys are pretty strong, and physically very capable."
Post mortem results showed there might have been underlying health problems that contributed to the death.
Temba might well have hidden any illness, Horton said, to keep his place in the social structure.
"Chimps...will try to show a strong front in order to not compromise themselves socially...it's what it's all about, especially for a young male."
Both chimps were born in the zoo, with Temba aged 21 and at the peak of his physical powers, and Marty aged 28, Horton said