I also seriously doubt the claim that cannibalism isn't "normal" in any vertebrate species; I'm not even sure that can be determined in any meaningful way. It clearly can be shown that it exists in many species, even higher mammals. Whether or not it should be considered "normal" is a matter of judgment.
I tried to edit the article with the first paragraph above in mind. I didn't know how to edit the article with the second paragraph in mind--probably, the author of that comment could help. --LMS
For some species, cannibalism under certain well-defined circumstances, such as the female black widow spider eating the male after mating, is a normal part of the life cycle.
You did a good job, but this isn't really true - all the cases of supposedly cannibalism being a normal part of mating, at least, fall through under investigation ([Stephen J. Gould]? did an essay on this). For widows, the female ignores the male as often as not, suggesting that when she does eat him it is because he is a little bug: indistinct voracity rather than instinctive cannibalism. And similar for all the other classic examples. Male mantids, for instance, are only eaten some of the time and try their hardest not to be. This is not especially different from fish eating their young when hungry. I'm not really sure how the above should be tweaked.
Is this widely-agreed upon, or does the paragraph only give one side of what is in fact a controversy? I don't know, which is why I'm asking. --LMS
If someone with a greater knowledge of the field wishes to add further detail then I would be happy. Anthropology is something I have an interest in, rather than an active engagement. PL
Here, for instance, in the "virtual hospital," http://www.vh.org/Providers/TeachingFiles/CNSInfDisR2/Text/PInf.CDE.html
this mechanism of transmission is quite taken for granted.
BTW, I once read (somewhere, I think a book about AIDS) that in private interviews, new guinea tribesmen would admit that they wouldn't actually *eat* the meat, but just palm it to make it look like they did, because it repulsed them... The story had to do with how some virus was presumed to have been spread, but it couldn't have considering that the theory was based on consumption of infected humans.
...but the whole thing sounds unverifiable one way or the other--I also read a book on a similar subject by some german guy who contended that human sacrifice stories were invariably made up. It was probably the most unconvincing book in the world, claiming that the aztecs only *drew* depcitions of human sacrifices, wrote stories about them, and that the altars were candy bowls or some crap. -AD.