To my big fancy human brain, this test seems pretty simple, and if you just fiddle with it for a little while you'll succeed. Are there examples of animals that

To my big fancy human brain, this test seems pretty simple, and if you just fiddle with it for a little while you'll succeed. Are there examples of animals that totally fail the string-pull test? Also, there is some research out (free full text linked below) there that suggests string-pulling doesn't require any forethought but is just a feedback loop of "ooh, I did this and saw my treat move, I'll do it again" Taylor, A. H., Knaebe, B., & Gray, R. D. (2012). An end to insight? New Caledonian crows can spontaneously solve problems without planning their actions. Proceedings. Biological sciences, 279(1749), 4977–4981. https://doi.org/10.1098/rspb.2012.1998 https://doi.org/10.1098/rspb.2012.1998