Mama monkeys give in to tantrums...when others are watching

Photo by Stuart Semple
Female rhesus macaques and their babies cluster amiably, but an infant tantrum can disrupt the scene

Have you ever been in a public place when your toddler throws a tantrum? I have and it's pretty embarrassing. Not because of the crying, per se, but because onlookers may glare. In fact, I admit to occasionally looking with disapproval myself at other parents who ignore their babies' loud distress. It's distressing to me to listen to it.

Does the presence of disapproving onlookers have any effect on how human moms react to tantrums? You bet.

Turns out the same dynamic goes on in troops of monkeys.

Behavioral scientist Stuart Semple & his colleagues studied monkey tantrums and bystander reactions by watching rhesus macaques that roam freely on the island of Cayo Santiago, Puerto Rico. Baby monkeys wanting to be nursed when mom wasn’t willing often started shrieking. For more than 300 outbursts of baby crying, the scientists noted which other monkeys, if any, were within two meters. The team also noted how mom, baby and the bystanders interacted.

The researchers found that the monkey mothers are twice as likely to let a howling infant have its way during very public tantrums than during more private moments, says Stuart Semple of Roehampton University in London.

Not a bad decision on mom’s part. A baby rhesus monkey makes a high-pitched, grating shriek that Semple calls “pretty harsh stuff.” Onlookers get restless and irritable; in fact, a mom and unhappy baby are 30 times more likely to suffer aggression from a bystander during a crying bout than they would in quiet times. Onlookers within two meters made threatening gestures, or even chased, grabbed or bit the mother or the infant.

Most of the aggression came from monkeys that weren't close relatives and outranked mom in the social hierarchy. Her relatives proved more tolerant.

When moms and babies weren’t close to other monkeys, rebuffed babies that started shrieking were allowed to nurse 39 percent of the time, the researchers found. With just relatives nearby, the babies’ luck rose to 53 percent. But with unrelated onlookers that outranked mom in the dominance hierarchy, babies won the tantrum 81 percent of the time.

Photo by Stuart Semple
If baby cries when they're alone, the tantrum has only a 39% chance of changing mom's mind.

Mom herself gets agitated by the baby’s crying. Analyzing records of mothers' behavior, the researchers calculated that a female on average was 400 times more likely to get aggressive toward her baby when it was crying than when it wasn't. Wow! That surprised me! Must be lots of adult monkeys out there with unresolved "issues" with mom! I tend to think of non-human mammals as always being kind and attentive to their young. But I guess not...

Studies of communication often focus on just two parties, the one sending the message and the intended receiver, Semple says. But the real world is full of other eyes and ears, ones that senders and receivers often react to. “We need to start thinking about communication in more realistic terms,” he says.

Research has found that nonhuman primates pay attention to eavesdropping bystanders, “but this is the first demonstration that communication between mother and infant is affected by an audience,” says behavioral biologist Dario Maestripieri of the University of Chicago.

Other baby primates besides humans and macaques throw tantrums, says behavioral biologist Liesbeth Sterck of Utrecht University in the Netherlands. The Thomas langurs she watches certainly do. However, she points out that langurs do more "allomothering," caring for infants other than their own, than rhesus macaques do. That behavior may affect the dynamics in this and other species, she says.

Semple and his colleagues report online March 10 in Proceedings of the Royal Society B. time.

Source: Susan Milius. Public tantrums defeat monkey moms too. Science News. April 11, 2009. Vol. 175 #8

Keywords:: monkey behavior rhesus macaques Stuart Semple Sally Kneidel maternal behavior monkey aggression primate behavior primate aggression primate mothering

Links to some of my previous posts on this blog about monkeys and chimps:
(to find others, enter "primates" in the search bar above)

Angry chimp reveals "uniquely human" trait

Monkeys and parrots pouring in from the jungle

Almonds or pizza? Capuchins are smarter than we thought

Exciting new discovery: chimps' short-term memory is better than humans'

Chimps share the human trait of altruism

Monkeys can estimate numbers as well as Duke students

U.S. labs import thousands of wild-caught primates

Chimps and gibbons have human elements to their speech

Research shows older females preferred as mates

Top 6 ways to protect wildlife from commercial trade

Wildlife trade, forestry, and the value of activism

Monkeylala (by Ken Kneidel)

Wild monkeys use tools - and choose the right one for the job

The first monkeys I ever saw in the wild were white-faced capuchins in Costa Rica. Or maybe black howlers were first. But the capuchins were much more charming than the howlers. I fell in love with them. We were on the beach at Manuel Antonio Parque Nacional the first time, and my son Alan had a banana in his pocket. The capuchins were interested in us because of the banana, and they had no fear. The howlers and spider monkeys and squirrel monkeys will stay up in the trees, far away from you, no matter what you have or do. But the capuchins come right down. They even ran out on the beach and snatched things from people's picnic baskets. The capuchins, with their human-like faces and hands, sat in the trees eating bags of crackers and throwing the cellophane wrappers down.

A white-faced capuchin at Manuel Antonio Parque Nacional in Costa Rica, smelling the banana in Alan's pocket
Photo by Sally Kneidel

As a biologist, I know that's not a good thing at all. But yet, I could see myself in the capuchins. I also do what I'm not supposed to do, eat things I know aren't good for me, make choices that endanger my well-being. We were tempted to give the capuchins the banana, but we didn't. We didn't give them anything to eat, we knew better than that. Monkeys that eat human food get sick eventually from malnutrition.

But the next day, we asked the ranger what time the troop of capuchins usually moved through the trees over the beach, on their daily foraging rounds. Our Spanish communication wasn't precise, but he told us and we got the idea. We waited for the monkeys. They came. And they were mad that Alan and I were standing under the trees while they were cavorting from branch to branch, just overhead. The head honcho, a male capuchin, came down and bared his teeth at us and shook the branches to frighten us. We trembled with delight instead.... the pleasure of recalling it even now makes my heart beat fast. We took his photo while he railed at us, infuriated. I was sorry to distress him, but I couldn't help it. Monkeys are territorial, they get angry just like anyone whose space is invaded. It wouldn't hurt him to bare his teeth and shake a few branches. His social stature with his troop may have benefitted from the display.

The capuchin was angry that we were standing under the trees in his foraging route. He bared his teeth aggressively.
Photo by Sally Kneidel

Anyway, I started this post to write about a news story that just came out about capuchins. Capuchins used to be "organ grinder" monkeys. These days they're sometimes trained as "helping hand" monkeys for people with paraplegia or quadriplegia. They're very smart monkeys. This recent piece of research shows that capuchins in Brazil are adept at tool use - an ability that used to be attributed only to humans but has now been demonstrated by numerous species from birds to apes. The capuchins use stones to crack open hard-shelled nuts. But the research goes far beyond just demonstrating tool use. The capuchins don't just grab the nearest rock at hand. They select the best tool for the job. Primatologist Elisabetta Visalberghi of the Institute of Cognitive Sciences and Technologies in Rome has shown that these monkeys draw on knowledge of a variety of nuts and stones to select the most effective implement. She studied the monkeys in the wild and observed that they generally approached two or three stones that differed in hardness, size, or weight. In nearly every case, the monkeys chose the most appropriate stone.

"The present findings make capuchins a compelling model to track the evolutionary roots of stone-tool use," says Visalberghi. Because capuchins shared a common ancestor with humans 35 million years ago, Visalberghi feels that their behavior may demonstrate that the capacity for tool use evoloved earlier than thought.

But primatologist Frans de Waal of Emory University has a different interpretation. He says the work highlights the monkeys' capacity for trial-and-error learning, that planning may not have been a part of their tool preferences. The monkeys may be simply applying life lessons about the success of various stones at cracking nuts.

Capuchins in Brazil selecting stones for cracking nuts, from Wired Science

Whether their discriminatory skills are the result of planning or of learning, they're still a step beyond simple tool use. They demonstrate in a non-human animal the ability to select and apply an appropriate tool for a particular job. We humans are not so unique after all. Do we really deserve to claim the whole planet all for ourselves and crowd out every other species of animal, leaving only the pest species, the livestock, and the companion species? I hope not. I hope the capuchins will always be alive and well in Costa Rica and Brazil, not displaced by cattle pastures.

Source:
Bruce Bower. Monkeys pick the right rock. Science News. February 14, 2009.

Keywords:: capuchins tool use animal behavior monkeys Costa Rica

The Wildlife Trade, Forestry, and the Value of Activism

Photo from www.animalsvoice.com

We've been interviewing scientists and environmental activists about the global trade in wildlife, for the new book. We've also been interviewing and reading about the conversion of Southern forests to pine plantations, which are chemically managed monocultures that have only 5% to 10% of the diversity of a native forest, according to Harvard biologist E.O. Wilson. A pine plantation is essentially a factory farm. By the year 2040, estimates a US Forest Service official, 70% of Southern forests will have been clear-cut and replanted as pine plantations. Most of those pines are being used to make paper and fiberboard for construction. One solution to that is use post-consumer recycled paper, use less paper, buy FSC certified wood products and SmartWood certified paper products. But more about that in a later post. Right now, I want to tell you about the wildlife trade, and the power of activism.

According to INTERPOL, the international police agency, the illegal wildlife trade is a $10-billion-a-year business, second only to drugs in the amount of money generated illegally. The animals are sold for food, for laboratory research, for exhibition, and for pets.

Here's what else I discovered last week that shocked me: The United States is the world's biggest consumer of wildlife, both alive and dead. We import four times more primates than any other country, most of which go into biomedical research or pharmaceutical testing. I guess I naively thought that all primates used for medical experiments were bred in captivity. And the World Wildlife Fund says that most of them are. But....we're still importing more than 20,000 a year. An imported wild-caught primate costs only one-third as much as raising a primate from birth in captivity. So some of those raised in labs are sold to foreign labs, and replaced with imports. Obscene! Corporations will just use whatever is cheaper, with no regard for the cost to the planet, or the sustainability of such priorities. I'm tired of seeing that over and over - with farmed animals, with the management of cropfields and forests for timber, with the crops and animals that provide our fabrics, and with unskilled workers, especially agricultural workers and garment workers in the Global South. It's ugly.

The fact that corporations' only true objective is to maximize profits for the shareholder is dangerous to the planet....but we have to remember that those profits come from us, as consumers. We can withhold our money from companies using the most egregious practices. Paul McCartney donates a lot of money to cancer research, in honor of his late wife Linda. But he stipulates that the money cannot go to research that's using animals. Paul has written that money spent on health education, prevention, and screening is more effective in combatting cancer than animal research is. Apparently a lot of the medical research is due to inertia - just using animals because we always have. Some of that research can be done on tissues rather than live animals. We can all start asking more questions of biomedical research companies and drug companies, especially if we're making charitable donations to these companies, or investing in their stocks. They all have web sites with phone numbers to call, and addresses to send letters to. When you get a prescription filled, or buy an OTC drug, ask the pharmacist for the name of the company that made it. Then call them or write them a letter. Ask them for transparency in their testing procedures - tell them you want to know what animals were tested with that drug, and how the animals were housed and treated. Transparency - it's a good word, I keep seeing it in articles about corporate deception. If all of a company's practices are legit and above board, then there's no reason to keep anything secret. When something is secret, then for sure something is going on that the public would object to - if we only knew.

More and more, activist organizations are sending people undercover to work in research labs, in cosmetics testing facilities, in slaughterhouses, in sweatshops. We're seeing footage of what goes on, and we're learning to make demands.

One thing I keep seeing over and over, as I research all these different topics on environmental and labor and humane issues, is that companies often give way as a result of activists' demands. I'm really starting to think that grassroots activism can be just as powerful a tool as trying to get changes the nice and orderly way, such as working with legislators to get new regulations passed. Long and loud protests, with lots of media coverage - companies don't like 'em. Activism has been responsible for a number of reforms in the timber and paper industry, and in the meat industry. Because of PETA's demands, McDonalds changed their policy for the egg factories that provide their eggs. Now the cages can have only 5 hens per cage rather than 7. The egg factory we toured for our recent book Veggie Revolution had 5 hens per cage, and they were too crowded to lift their wings. But with 7 in the cage, they would've been unable to budge at all. It's a small step, yes, but a step in the right direction. And if you're one of the caged hens, it's a significant difference. It's a change that signals a more cooperative corporate attitude - which means more change is coming. In the timber and pulp industry, activist groups such as Forest Ethics and the Dogwood Alliance have been able to get Home Depot to carry 'Forest Stewardship Certified' wood products, and also to stop buying wood from the world's 10 most endangered forests. See The Home Depot web site for details. We (Sara Kate) took part in the Dogwood Alliance demonstrations that got Staples and Office Depot to agree to several forest-conservation measures, including phasing out products from old-growth forests, and carrying post-consumer recycled paper. See the Dogwood Alliance web site for info on those successful office supply campaigns.

From the Dogwood Alliance, a description of their grassroots campaign to change Staples policies:

"On November 12, 2002, Dogwood Alliance joined office supply giant Staples Inc. in a joint press conference to announce the company's public release of landmark environmental paper procurement policy. This announcement marked the end of a two-year campaign led by Dogwood Alliance and our partner ForestEthics and involving dozens of local, regional and national groups and thousands of individuals. Collectively, we generated over 600 demonstrations, 15,000 postcards, thousands of phone calls to the corporate headquarters and regional offices, hundreds of letters from concerned citizens, coverage in more than 10 national media outlets and over 50 local media outlets, introduced a shareholder's resolution, generated a letter to the CEO signed by over 150 religious leaders, and produced a public service announcement with the rock band R.E.M. This campaign victory is testament to the power of citizens joining together to demand corporate environmental accountability."

Now, when we go in Staples, we can buy post-consumer recycled paper. They didn't have it before. Scot Quaranda, one of the leaders of the Dogwood Alliance, says that they're working on new campaigns now with other companies that market forest products.

Being vocal and active can have results, especially when we join together.

But back to the topic of wildlife trade - another big piece of it is the trade in pet birds, especially birds in the parrot family - parakeets, macaws, and some others. They are extremely smart birds. One African gray parrot has learned to count up to 6 objects accurately and to learn language as well as chimps have learned it - combining words in new ways to ask for what he needs or to answer questions.

But parrots are in trouble. According to the 2002 IUCN Red List of Threatened Species, 94 of the world's parrot species are considered to be threatened with extinction, largely because of habitat loss and excessive capture for trade.

Although the smuggling of wild-caught birds into the US has declined since the Wild Bird Conservation Act was passed in 1992, USF&W officials estimate that as many as 20,000 birds are smuggled in every year, just from Mexico.

What can you do about that? If you buy a pet bird - be sure and double sure that it was bred in captivity. Ask for documentation. Or better yet, call your local Humane Society or Animal Control office and see if there is a sanctuary for homeless pet birds near you. You may be able to adopt one. Sort of like buying vintage clothes, or burning waste veg oil in your diesel tank - you're not creating a market for it, and you're helping an out-of-luck bird.

We can make a difference. Especially when we work together.