Okay, there’s no evidence (yet) that pigeons prefer Chagall to Van Gogh or vice versa. But they can tell them apart. How much evidence of sentience is enough, before we start to rethink the way we treat our fellow sentient creatures?
Self-recognition is found in large primates such as chimpanzees, and recent findings show that dolphins and elephants also have such intelligence. Proving that pigeons also have this ability show that such high intelligence as self-recognition can be seen in various animals, and are not limited to primates and dolphins that have large brains.
UPI has the story on the wires (thank you, Claire, for the heads-up), but more details can be found at Science Daily.
ScienceDaily (Jun. 14, 2008) — Keio University scientists have shown that pigeons are able to discriminate video images of themselves even with a 5-7 second delay, thus having self-cognitive abilities higher than 3-year-old children who have difficulty recognizing their self-image with only a 2 second delay.
Prof. Shigeru Watanabe of the Graduate School of Human Relations of Keio University and Tsukuba University graduate student Kohji Toda trained pigeons to discriminate real-time self-image using mirrors as well as videotaped self-image, and proved that pigeons can recognize video images that reflect their movements as self-image.
We can argue over the details of how to prove self-cognition, but the article has a detailed discussion of the methods and functional definitions that studies like this one have been using for almost 40 years now.
The wire and other reports of this study make much of the fact that, using these functional definitions, pigeons do better at self-recognition than 3-year-old humans. Personally, I find at least as interesting a fact in the UPI story not even mentioned in Science Daily, that the pigeons can distinguish Chagall paintings from those of Van Gogh.
People with cats and dogs routinely ascribe to them motives, beliefs, preferences, fears, desires, and other complex mental states. People on farms, who spend as much time with cows and pigs and horses as we do with dogs and cats, talk about them in the same way.
Leaving aside the question of eating them for food, how can we confine them, keep them perpetually pregnant, separate them from their young at birth, feed them cement kiln dust, testosterone, progesterone, anabolic steroids, and chicken manure…. how can we hang a 1500-lb animal upside down by its ankle when it’s still conscious?
How can we treat an animal with cognitive abilities that can, at least in some ways, be favorably compared to a 3-year-old with wanton disregard for its obvious suffering?