I don't want to suggest that this isn't very cool, but there was one thing about it that bugged me a little.
The researcher put the cylinder in the cage, and after the rook comes over to investigate, the researcher comes back and puts a handful of rocks right next to the cylinder. That seems like it would suggest to the rook that there's some connection between the cylinder and the rocks.
Again, it's still very impressive (especially considering the speed with which the bird puts two and two together), but it's not quite the same as the bird thinking, on its own, "Hey, you know what would help with this puzzle? Those rocks that appeared last week on the other side of my cage."
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I don't want to suggest that this isn't very cool, but there was one thing about it that bugged me a little.
The researcher put the cylinder in the cage, and after the rook comes over to investigate, the researcher comes back and puts a handful of rocks right next to the cylinder. That seems like it would suggest to the rook that there's some connection between the cylinder and the rocks.
Again, it's still very impressive (especially considering the speed with which the bird puts two and two together), but it's not quite the same as the bird thinking, on its own, "Hey, you know what would help with this puzzle? Those rocks that appeared last week on the other side of my cage."