It takes a woman, a dainty woman...[1]

To bite the head off the offspring of an immigrating competitor... Where that 'woman' is a female Sonso chimp at least.

The paper is available here if you have a subscription to Current Biology.

If not, both the BBC and the University of St Andrews website cover the story.

This behaviour was first reported by Jane Goodall in the 1970s. From the St Andrews website:

Similar behaviour was described by eminent primatologist Jane Goodall at Gombe Stream National Park in the 1970s but her observations had long been disregarded as inconsistent and pathological.

QSFP[2].

[1] From "Hello Dolly":

The frail young maiden who's constantly there
For washing and blueing and shoeing the mare
And it takes a female for setting the table
And weaving the Guernsey
And cleaning the stable
...
And in the winter she'll shovel the ice
And lovingly set out the traps for the mice
She's a joy and treasure for practically speaking
To whom can you turn when the plumbing is leaking?

[2]Quelle Sur-Fucking-Prise.