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The dolphins spent far more time near the mirror, inspecting their reflection, when they had been visibly marked than when they had been sham marked. They seemed to recognize that the mark they saw in the mirror had been put on their own body. Since they hardly paid any attention to marks on other dolphins, it was not as if they were obsessed with marks in general. They were specifically interested in the ones on themselves. Critics complained that the dolphins in this study failed to touch their own body. or rub off the mark, as humans or apes do, but I’m not sure we should hold the absence of self-touching against an animal that lacks the anatomy for it. Until better tests have been designed, it seems safe to let dolphins join the cognitive elite of animals that recognize themselves in a mirror.
Dolphins possess large brains (larger than humans, in fact), and show every sign of high intelligence. Each individual produces its own unique whistle sound by which the others recognize him or her, and there are even indications that they use these sounds to call each other “by name,” so to speak. They enjoy lifelong bonds, and reconcile after fights by means of sexy petting (much like bonobos), while males form power-seeking coalitions. They may encircle a school of herring to drive them together in a compact ball, releasing bubbles to keep them in place, after which they pick their food like fruit from a tree.
With regard to the co-emergence hypothesis, it is important to note the level of dolphin altruism. Does self-awareness go hand in hand with perspective-taking, and do dolphins show the sort of targeted helping known of humans and apes? One of the oldest reports in the scientific literature concerns an incident on October 30, 1954, off the coast of Florida. During a capture expedition for a public aquarium, a stick of dynamite was set off underwater near a pod of bottlenose dolphins. As soon as one stunned victim surfaced, heavily listing, two other dolphins came to its aid: “One came up from below on each side, and placing the upper lateral part of their heads approximately beneath the pectoral fins of the injured one, they buoyed it to the surface in an apparent effort to allow it to breathe while it remained partially stunned.” The two helpers were submerged, which meant that they couldn’t breathe during their effort. The entire pod remained nearby (whereas normally they’d take off immediately after an explosion), and waited until their companion had recovered. They then all fled in a hurry, making tremendous leaps. The scientists reporting this incident added: “There is no doubt in our minds that the cooperative assistance displayed for their own species was real and deliberate.
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