"I suppose the first really significant thing that the world heard about was chimpanzees using and making tools.

VOA: special.2009.11.18

They believe the simian immunodeficiency virus,S.I.V., probably crossed from chimpanzees to humans in the last one hundred years.

VOA: special.2009.09.08

Over the past fifty years, she has made very important discoveries about the social behavior of chimpanzees.

VOA: special.2009.11.18

People who like chimpanzees can visit Gombe Stream National Park on the western border of the country.

VOA: special.2009.08.19

He later asked her to study a group of chimpanzees living by a lake in Tanzania.

VOA: special.2009.11.18

He responded by saying: "Now we must redefine 'tool', redefine 'man', or accept chimpanzees as human."

VOA: special.2009.11.18

Doctor Hahn and her team gathered liquid and solid waste from chimpanzees in the park.

VOA: special.2009.09.08

Her scientific research was published in the book "The Chimpanzees of Gombe: Patterns of Behavior."

VOA: special.2009.11.18

"That led to this extraordinary opportunity to study, not just any animal,but chimpanzees.

VOA: special.2009.11.18

Miz Goodall has written many books for adults and children about wild chimpanzees.

VOA: special.2009.11.18

Doctor Hahn notes that chimpanzees are ninety-eight percent genetically identical to humans.

VOA: special.2009.09.08

Chimpanzees share about ninety eight percent of their genes with humans.

VOA: special.2009.08.19

Very little was known about wild chimpanzees at the time.

VOA: special.2009.11.18

Now,researchers say they have evidence that chimpanzees with S.I.V.

VOA: special.2009.09.08

It would also "release federally-owned chimpanzees, about half of the thousand chimpanzees that are languishing in American laboratories today, to sanctuaries."

VOA: standard.2010.02.16

VandeBerg says he and his colleagues go out of their way to use lower forms of animals before experimenting on chimpanzees.

VOA: standard.2010.02.16

Until the measure becomes law, medical testing on chimpanzees will continue to be a highly divisive, and hotly debated,issue.

VOA: standard.2010.02.16

She spent decades studying and living among Central African chimpanzees in the wild and now campaigns to protect the endangered species.

VOA: standard.2010.02.16

According to Ferdowsian, the Great Ape Protection Act,or GAPA, "would ban all invasive and harmful research on chimpanzees in American laboratories."

VOA: standard.2010.02.16

Besides its ethical objections, PCRM argues that the use of chimpanzees in the lab is an ineffective way to advance medical research.

VOA: standard.2010.02.16

The United States is the only country in the world that still allows federally-funded medical experiments on chimpanzees.

VOA: standard.2010.02.16

And the research that's been conducted on chimpanzees so far says VandeBerghas,already benefited much of the world's population.

VOA: standard.2010.02.16