Chimpanzee Information: Tree Climbing Abilities of Early Hominins Decreased

Thursday, April 16, 2009

Tree Climbing Abilities of Early Hominins Decreased

Anthropologist Says Tree Climbing Abilities of Early Hominins Decreased Rapidly in Evolutionary Process

April 15th, 2009 by Mary Anne Simpson Uganda Wild Chimps

Credit: Mongabay.com

Jeremy M. DeSilva an anthropologist at Worcester University in Massachusetts has published "Functional Morphology of the Ankle and the Likelihood of Climbing in Early Hominins," in the peer-reviewed journal, Proceeding of the National Academies of Sciences of the USA current issue. The study includes data gathered by DeSilva in Uganda's Kibale National Park of modern chimpanzee and comparisons of hominin fossil skeletal remains dating back some 4.12 million to 1.53 million years ago. The findings appear to show that if early hominins depended on tree climbing as part of their survival repertoire, they were performing it decidedly different from modern chimpanzee locomotor activity.

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Most human evolution researchers agree that at some point in history, estimated to be about 5 million to 7 million years ago the chimpanzee and human like species proceeded on a different evolutionary path. The question DeSilva addresses is whether early man's adaptation to full bipedalism involved a swift shedding of the ability to climb and swing from trees. DeSilva compared the great apes and early hominin ankle joint, the tibia and the talus in the foot. He discovered marked differences between the structure and capacity of these two skeletal fossils.

DeSilva observed and filmed Uganda's modern chimps tree climbing and tree swinging activity. He discovered that modern chimpanzees when pushing off from a tree branch flex their ankles, thereby raising their foot some 45 degrees. Modern man generally flexes his ankle only 15 to 20 degrees while walking and suffers injury if stretched any further. It goes without saying, there are certain super modern athletes who can flex the ankle without injury.

In effect, DeSilva points to an important evolutionary divide, wherein early hominin may have foregone his natural tree climbing, ankle flexing capacity in order to walk upright. His examination of early hominin and the great ape indicates the evolutionary morphing took place very rapidly. His review of early hominin and the great ape demonstrate the ankle joint differences took place early in the evolutionary cycle.

According to ScienceNow reporter Michael Baiter in his article, "Our Ancestors Were No Swingers", David Begum, a paleoanthropologist at the University of Toronto in Canada points to early hominins ability to scramble up a tree for safety which would not have involved or required the full 45 degree ankle flex exhibited by modern chimpanzees.

The DeSilva study agrees with its critics. He concludes that if early hominins included tree climbing as part of their survival skill set, they were performing it very differently than modern chimpanzees."

Sources:

PNAS, April 13, 2009, http://www.pnas.org/content/early/2009/04/13/0900270106.abstract
Science Now, April 13, 2009, http://sciencenow.sciencemag.org/cgi/content/full/2009/413/2

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January's Article

From the Fall of 2008 Through 2009 – The Chimpanzee Year in Review

This past year has been one of sadness, sorrow, change, and hope. I would like to take this opportunity, as we begin 2010, to reflect back and highlight the changes that we now, hopefully, are really beginning to see as the world’s attitude towards privately owned chimpanzees, and primates in general, change in a positive way.

The highlights begin, actually, late in the fall of 2008 when our chimps, Mikey and Louie, the two busiest and most popular working chimpanzees in America, retired to Little Rock Zoo. I wanted them to have a future as part of a family of chimps, and to have a safe and permanent home that they could live their life as chimpanzees, not a member of the human society.

In November of 2009, Connor and Kramer the chimpanzees owned by private pet owner Jeanne Rizzotto escape from her home near Red Lodge, Montana. They spent over an hour running loose, crossing highways and entering neighbor’s property. Connor, a habitual biter as described in court papers filed after the incident, bites a woman on the arm as she tries to keep him out of her home, losing 6-8 inches of skin from her arm. Rizzotto is told to keep the chimps in quarantine at her home while health officials investigate the incident. Rizzotto claims the chimps were let out by a vandal that had cut a lock, however that remains unproven. All of these articles have been posted on this Simian Library.

In February, 2009, tragedy strikes, and the world’s attention turns to the issue of private ownership of chimpanzees. On a cold afternoon in Stamford Connecticut, Travis the Chimpanzee attacks a long time friend of owner Sandra Herold named Charla Nash in Herold’s driveway. Travis is shot and killed by a patrol officer as the 14 year old, 200 pound male chimpanzee; tries to pry open the door of his patrol car as he responded to the tragedy. Nash is rushed to the hospital, and remains in a coma for months.

Weeks later, in early March, the US House of Representatives passes the Captive Primate Safety Act, banning sales of all primates across state lines. The bill moves on to the senate, where it still sits, not being acted on, to this day.

In late November, 2008, neighbors turned in a couple in Houston, Texas for a chimpanzee living in a garage in a suburban neighborhood. Fred Henry, now known simply as Henry, was over fifteen years old and had been living in the garage in a cage for 15 years. Weighing only 65 pounds, about 100 pounds underweight, the emaciated chimp is taken to the local SPCA where veterinarians and animal officials nurse him back to health. On Feb 23, 2009, Henry is moved to Chimp Haven in Shreveport, LA to live out the rest of his life with other chimps in a safe and enriching environment.

Later in March, a chimpanzee named Timmy escapes from his owners’ home in rural Missouri. The owner, Mary Overton, was a former director of The Simian Society of America, a group that promotes and encourages private primate ownership. Timmy is shot and killed by a police officer as he attempts to pry open the door to the officer’s patrol car. Investigators charge all residents of the home with animal cruelty, as they find a “puppy mill” on the premises, with dead dog carcasses scattered throughout the property and over a hundred sick and undernourished animals, including several monkeys.

On March 4, 2009 Nightline on ABC airs over fifteen minutes of footage taken by a HSUS undercover worker at the University Of Louisiana Lafayette National Primate Research Center. The video shows acts of cruelty and inhumane treatment of chimpanzees, including scores of baby chimpanzees in a holding cell with no enrichment or even a blanket. The video brings new awareness to the plight of research chimpanzees, and turns up the pressure on the labs. A follow up investigation by the USDA, following the issuance of a 108 page complaint by the HSUS against the lab, reinforces the findings of the video taken.

Carole Noon, founder and director of Save the Chimps in New Mexico and Fort Pierce Florida passes away from pancreatic cancer at the age of 59. Noon, perhaps the world’s most famous chimpanzee advocate, founded Save the Chimps in 1997. She led the purchase of the former troubled Coulston Foundation research facility near Almagordo, New Mexico in order to rescue over 250 chimpanzees that had been used by the government for research, mostly from the space program in the 60’s and 70’s. The chimpanzees in her care, now numbering over 270, were being moved from New Mexico to the Florida facility, hailed as the largest chimpanzee sanctuary in the world. Noon left a legacy of care, compassion, and love for the species that will never be duplicated. The chimpanzee community misses her dearly.

In June, a news story from a Tampa Florida television station airs a story about a baby chimpanzee now residing at Big Cat Habitat in Sarasota, Florida, home of the Rosaire family of circus trainers. The chimpanzee, named Eli, was supposedly rejected at birth by his mother and is being raised by Kay Rosaire and Gini Valbuena. Valbuena, a long time buyer of baby chimpanzees that once described herself as being “addicted to chimpanzees”, is advertised in the news story as the chimps’ “full time nanny”.

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The Rosaire’s had a coming out baby shower for the chimp in June, asking the public to donate toys and diapers, as well as pay the price of admission.

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In early September, Gini and the baby chimp are spotted at a winery in Florida, drinking mimosas and schmoozing with the public.

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Later in September, “chimpanzee encounters” with the baby chimpanzee and Gini Valbuena, are being advertised on a play for fee basis on the Big Cat Habitat home page. The addiction continues.

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On December 10, 2009 Tom, a 44 year old chimpanzee that lived the last 14 years at the wonderful Fauna Foundation in Canada, passed away. Tom had been a research chimpanzee for the first thirty years of his life, languishing in a five foot by five foot by seven foot high stainless steel cage. He was the victim of countless laboratory tests, biopsies, injections, and suffering. Tom was the face of Project R&R, aimed at releasing all chimpanzees from biomedical and invasive research, and the driving force behind the Great Ape Protection Act now before Congress. There are still 1400 chimpanzees used in biomedical research in the United States today.

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On December 17^th, 2009, ten more chimpanzees arrived in Fort Pierce Florida as part of the Great Chimp Migration continues. Save the Chimps, the largest chimpanzee sanctuary in the world, transfers ten chimps at a time to the islands in the Florida facility as funds allow. An anonymous donor gave the $25,000 for this trip, and the Arcus Foundation has agreed to match all funds donated to Save the Chimps up until April of 2010. Start your year right – and donate to the Great Chimp Migration today!

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The Little Rock Zoo

Thursday, April 16, 2009

Tree Climbing Abilities of Early Hominins Decreased

Anthropologist Says Tree Climbing Abilities of Early Hominins Decreased Rapidly in Evolutionary Process

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