Cockatoos make economic decisions about tool use depending on the current 'market' situation
As animal tool use events are extremely rare, is often quickly rated as intelligent. Nevertheless, some types of tool use can be controlled by much simpler processes that are a part of the respective animal's inborn behavioural repertoire. Intelligent tool use requires the ability to flexibly adapt a behaviour to changing environmental situations. The Indonesian Goffin's cockatoo has even the rare capacity to use two different types of tools (sticks for probing and raking food into reach as well dropping stones/balls into tubes to knock out a reward inside). The same birds also previously showed a solid performance in the classic "marshmallow" experiment from human psychology: They controlled their impulse to consume an immediate lower quality food item in the prospect of gaining a better food type after a time delay.