Stomach, the way to you lover's heart, say male chimps

Science Daily writes:
They say that the way to a man's heart is through his stomach and the same could be said for female chimpanzees. Researchers studying wild chimps in West Africa have discovered that males pinch desirable fruits from local farms and orchards as a means of attracting female mates.
Lead researcher, Dr Kimberley Hockings from the University of Stirling's Department of Psychology said: "We believe the males may be using crop-raids as a way to advertise their prowess to other group-members, especially the opposite sex. Such daring behaviour certainly seems to be an attractive trait and possessing a sought-after food item, such as papaya, appears to draw even more positive attention from the females."

The study, which took place in the West African village of Bossou in the Republic of Guinea, is the only recorded example of regular sharing of plant foods by unrelated, non-provisioned wild chimpanzees.

Dr Hockings explained: "It is unusual behaviour as even though the major part of chimpanzees' diets consists of plant foods, wild plant food sharing (defined as an individual holding a food item but allowing another individual to consume part of that item) occurs infrequently. However, in chimpanzee communities that engage in hunting, meat is frequently used as a 'social tool' for nurturing alliances and social bonds.

This research shows that chimpanzees at Bossou use crop-raiding as an opportunity to obtain and share desirable foods, providing further insights into the evolutionary basis of human food sharing. In humans, the pursuit of certain foods is also strongly sex-biased; for example, it has been proposed that men in hunter-gatherer societies acquire large and risky-to-obtain food packages for social strategising and to garner attention."

The researchers found that adult males mainly shared the spoils of their crop-raids with females of reproductive age; particularly with a female within the group who took part in most consortships (where an adult female and an adult male chimpanzee move to the periphery of their community so that the male gains exclusive mating access).

Dr Hockings said: "The male who shared the most food with this female engaged in more consortships with her and received more grooming from her than the other males, even the alpha male. Therefore the male chimpanzees appear to be 'showing off' and trading their forbidden fruit for other currencies, i.e. 'food-for-sex and --grooming'."

The study is published in the September 12 issue of the online, open-access journal PLoS One.

The study was carried out by the following researchers: Kimberley J. Hockings (University of Stirling), Tatyana Humle (University of Wisconsin-Madison), James R. Anderson (University of Stirling), Dora Biro (University Of Oxford), Claudia Sousa (New University of Lisbon), Gaku Ohashi (Kyoto University) and Tetsuro Matsuzawa (Kyoto University).

About wild chimpanzees

Wild chimpanzees have declined by more than 66% over the last 30 years, to a mere 200,000. Although the chimpanzees of Bossou are fortunate enough to be afforded a degree of protection and tolerance by local Manon people, other chimpanzee communities throughout Africa are not so privileged. Chimpanzees and other non-human primates are threatened by an intricate web of factors including unrelenting deforestation and fragmentation, poaching, disease, and capture for the pet trade, all of which threaten their long-term survival in the wild. These are human problems, the solutions to which will benefit both people and chimpanzees.

Cultivated plant foods are shared much more frequently than wild plant foods at Bossou, even though adult male chimpanzees often appear nervous when raiding crops (rough scratching, a self-directed behavioural pattern shown in response to anxiety, was used to quantify levels of anxiety). The shared cultivated fruits are usually large and easily divisible, and adult males are most likely to share such foods obtained in exposed locations and in the presence of local people (which is also associated with increased levels of anxiety).

Citation: Hockings KJ, Humle T, Anderson JR, Biro D, Sousa C, et al (2007) Chimpanzees Share Forbidden Fruit. PLoS ONE 2(9): e886. doi:10.1371/journal.pone.0000886

SKEPTIC
Scientific American September 2007 issue

Rational Atheism

An open letter to Messrs. Dawkins, Dennett, Harris and Hitchens

By Michael Shermer in Scientific American (Sept 2007 issue)

Since the turn of the millennium, a new militancy has arisen among religious skeptics in response to three threats to science and freedom: (1) attacks against evolution education and stem cell research; (2) breaks in the barrier separating church and state leading to political preferences for some faiths over others; and (3) fundamentalist terrorism here and abroad. Among many metrics available to track this skeptical movement is the ascension of four books to the august heights of the New York Times best-seller list—Sam Harris’s Letter to a Christian Nation (Knopf, 2006), Daniel Dennett’s Breaking the Spell (Viking, 2006), Christopher Hitchens’s God Is Not Great (Hachette Book Group, 2007) and Richard Dawkins’s The God Delusion (Houghton Mifflin, 2006)—that together, in Dawkins’s always poignant prose, “raise consciousness to the fact that to be an atheist is a realistic aspiration, and a brave and splendid one. You can be an atheist who is happy, balanced, moral and intellectually fulfilled.” Amen, brother.

Whenever religious beliefs conflict with scientific facts or violate principles of political liberty, we must respond with appropriate aplomb. Nevertheless, we should be cautious about irrational exuberance. I suggest that we raise our consciousness one tier higher for the following reasons.

1. Anti-something movements by themselves will fail. Atheists cannot simply define themselves by what they do not believe. As Austrian economist Ludwig von Mises warned his anti-Communist colleagues in the 1950s: “An anti-something movement displays a purely negative attitude. It has no chance whatever to succeed. Its passionate diatribes virtually advertise the program they attack. People must fight for something that they want to achieve, not simply reject an evil, however bad it may be.”

2. Positive assertions are necessary. Champion science and reason, as Charles Darwin suggested: “It appears to me (whether rightly or wrongly) that direct arguments against Christianity & theism produce hardly any effect on the public; & freedom of thought is best promoted by the gradual illumination of men’s minds which follow[s] from the advance of science. It has, therefore, been always my object to avoid writing on religion, & I have confined myself to science.”

3. Rational is as rational does. If it is our goal to raise people’s consciousness to the wonders of science and the power of reason, then we must apply science and reason to our own actions. It is irrational to take a hostile or condescending attitude toward religion because by doing so we virtually guarantee that religious people will respond in kind. As Carl Sagan cautioned in “The Burden of Skepticism,” a 1987 lecture, “You can get into a habit of thought in which you enjoy making fun of all those other people who don’t see things as clearly as you do. We have to guard carefully against it.”

4. The golden rule is symmetrical. In the words of the greatest conscious­ness raiser of the 20th century, Mart­in Luther King, Jr., in his epic “I Have a Dream” speech: “In the process of gaining our rightful place, we must not be guilty of wrong­ful deeds. Let us not seek to satisfy our thirst for freedom by drinking from the cup of bitterness and hatred. We must forever conduct our struggle on the high plane of dignity and discipline.” If atheists do not want theists to prejudge them in a negative light, then they must not do unto theists the same.

5. Promote freedom of belief and disbelief. A higher moral principle that encompasses both science and religion is the freedom to think, believe and act as we choose, so long as our thoughts, beliefs and actions do not infringe on the equal freedom of others. As long as religion does not threaten science and freedom, we should be respectful and tolerant because our freedom to disbelieve is inextricably bound to the freedom of others to believe.

As King, in addition, noted: “The marvelous new militancy which has engulfed the Negro community must not lead us to a distrust of all white people, for many of our white brothers, as evidenced by their presence here today, have come to realize that their destiny is tied up with our destiny. And they have come to realize that their freedom is inextricably bound to our freedom.”

Rational atheism values the truths of science and the power of reason, but the principle of freedom stands above both science and religion.

---

Michael Shermer is publisher of Skeptic (www.skeptic.com). His latest book is Why Darwin Matters (Henry Holt, 2006).