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#3 Grackle vs Crow - String pulling
Only 1 grackle spontaneously pulled a string, while many crows spontaneously pulled strings (though, at the individual level, crows did not attend to the functional differences among the strings).
Score 1:4

However, in a later experiment using a puzzlebox, most grackles pulled a string, which was one of four methods of accessing the food (https://doi.org/10.24072/pcjournal.284)

Grackle: https://doi.org/10.1098/rsos.160247
Crow: https://doi.org/10.1098/rspb.2012.1998
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