Zombie head
Barrel of monkeys was removed from RuneScape after an update, but still exists in-game for those who had obtained it.
This article is about the item won from the Squeal of Fortune. For the barrel from the Summer Beach Party, see Barrel of monkeys (Summer Beach Party).
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Barrel of monkeys (Squeal of Fortune) detail

A barrel of monkeys is one of the five monkey-themed items that was available from the Squeal of Fortune during the third Wild Weekend of Mad May. It was a common reward. It can be dropped on a surface (excluding bank areas) in RuneScape, releasing a number of grey, scampering monkeys (up to 10, and each monkey lasts roughly 30 seconds before disappearing) which move about randomly. It can only be used once, as the barrel will disappear with the monkeys after use. You can only place 1 barrel at a time. No warning message is given before it is used.

Placed monkey barrel