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. 2017 Jan 5;7:40062. doi: 10.1038/srep40062

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(a) correct support (supported in the centre of the box), (b,c) insufficient support (a greater surface area of the cheese was off the box than on the box), (d,e) no support (the cheese had no contact with the box and was suspended in mid-air) and (f,g) incorrect support (the surface area of one side of the cheese was in complete contact with the vertical edge of the box). Each set of support categories is duplicated with either a string up (could be supported by string, a,b,d,f) or a string down (not supported by string, c,e,g). Birds at age 3 months were presented with four images of the same four categories of support, but without any string (see methods).