Note the bipedal chimps in the accompanying photos...

https://www.mpg.de/17223684/0719-evan-lethal-attacks-by-chimpanzees-on-gorillas-observed-150495-x?c=2249

Research team now examines impact of food competition and climate change
JULY 19, 2021

A research team from Osnabrück University and the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, has, for the first time, observed
lethal attacks by chimpanzees on gorillas in the wild. Whether this
behavior is
due to competition for food or to the decline of the rainforest's
productivity
caused by climate change will now be investigated in more detail.
...
Lethal encounters between the chimpanzees and gorillas have so far never been documented. "Our observations provide the first evidence that the presence of chimpanzees can have a lethal impact on gorillas. We now want to
investigate the
factors triggering these surprisingly aggressive interactions," says
Tobias Deschner.

What exactly happened? Lara M. Southern, PhD student and first author of
the study,
recalls the first observation in 2019: "At first, we only noticed screams
of chimpanzees
and thought we were observing a typical encounter between individuals of neighboring chimpanzee communities. But then, we heard chest beats, a
display characteristic for gorillas, and realized that the chimpanzees had encountered a group
of five gorillas."

In the encounters, which lasted 52 and 79 minutes, the chimpanzees formed coalitions
and attacked the gorillas. The two silverbacks of the two groups and the
adult females
defended themselves and their offspring. Both silverbacks and several
adult females
escaped, but two gorilla infants were separated from their mothers and
were killed.
...

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