A-1 - Encouraged by What You Read?

I love cashew nuts! Apparently, so do capuchin monkeys.

A team of scientists from Oxford University (in the UK) and the University of Sao Paulo (in Brazil) report that capuchin monkeys in the northeast forests of Brazil make sophisticated use of stone tools to extract cashew nuts from shells. 1

These researchers claim that this find sheds light on the evolution of human behavior. However, I take a different view. I maintain that this discovery actually undermines the standard model for human evolution. At the same time, this work highlights human exceptionalism, which finds ready explanation in the biblical human origins account.2

Tools Engender New Scientific Possibilities 

This discovery, reported in the journal Current Biology, has found its way into popular science outlets, spurring headlines such as “Scientists Unearthed a Trove of 700-Year-Old Stone Tools—Used by Monkeys.” And with good reason. It is the first archaeological evidence for the use of stone tools by nonhuman primates outside of Africa, suggesting a whole new arena of scientific investigation. Lydia Luncz, a member of the research team, stated, “We think we’re just at the beginning.”3

To get to cashew nuts, capuchins go through an elaborate process. These monkeys carefully select large flat sandstones and quartzite to use as an anvil and hammer, respectively. They transport these stones to the base of the cashew trees. There, they place the cashew nut on the flat anvil (which is about four times the size of the hammer) and carefully strike the shell with the hammer (which is about four times the size of an average stone) breaking it open so they can get to the nut inside. Once they are done with the tools, the capuchins leave them at the base of cashew trees. A walk through the forest reveals a number of cashew nut processing centers, established by these industrious creatures.

To determine how long capuchins have engaged in this behavior, the research team excavated beneath several cashew trees located in the Brazilian forest. They discovered stone tools at least 2 feet beneath the surface that date back to about 700 years old. The excavated tools had a dark organic residue on them. Analysis of the residue indicates that it is the leftover remnants of cashew nuts, confirming the use of these stones as tools. Based on the excavations, it appears that about 100 generations of capuchins have employed stone tools to extract cashews from shells. It is reasonable to think that this behavior extends even further back in time.

This discovery follows on the heels of earlier work by the same team. In a previous study, these scientists observed Burmese long-tailed macaques in Thailand using stone tools to crack open shellfish, crabs, and nuts. Excavations at macaque sites on the island of Piak Nam Yai have identified stone tools that are about 65 years in age, going back two generations.

The use of stone tools among nonhuman primates is not limited to capuchins and macaques. Researchers have also uncovered evidence for chimpanzee stone tool use in Africa that dates back to over 4,000 years ago.

It seems as if hominids aren’t the only primates to leave behind an archaeological record.

Tools Throw Evolution into Question

The use of stone tools by capuchins, macaques, and chimpanzees has important implications for the creation-evolution debate. The tools used by these nonhuman primates is reminiscent of tools used by hominids. The similar behavior of hominids, Great Apes, and Old and New World monkeys renders the activities of hominids much less remarkable. I wrote elsewhere about the implications of tool use by chimpanzees (see here). The point I raised applies to the use of  stone tools by capuchins and macaques:

“Chimpanzee behavior is closer to what we infer about hominid behavior from the fossil record, particularly Homo habilis and Homo erectus. These creatures, too, made tools and engaged in hunting and scavenging activity. The temptation is to see hominid behavior as transitional, representing a path to modern human behavior. Yet the newly recognized behavior of chimpanzees distances the hominids from modern humans. Just because the habilines and erectines made tools and engaged in other remarkable behaviors doesn’t mean that they were ‘becoming human.’ Instead, their behavior appears to be increasingly animal-like, particularly when compared to chimp activities.”4

And, I would add, hominid behavior becomes even more animal-like when compared to the behavior of capuchins and macaques.

Who Was Adam? (book)
Chimpanzee’s Behavior Supports RTB’s Model for Humanity’s Origin” (article)
Chimpanzees’ Sleeping Habits Closer to Hominid Behavior Than to Humans’” (article)

"Made in God's Image: A Scientific Case for Human Uniqueness" (Video)


  1. Michael Haslam et al., “Pre-Columbian Monkey Tools,” Current Biology  26 (July 2016): pR521–R522, doi:10.1016/j.cub.2016.05.046.
  1. RTB’s biblical creation model for human origins views the hominids as creatures, created by God’s divine fiat, possessing intelligence and emotional capacity. These animals were able to employ crude tools and even adopt some level of “culture,” much like baboons, gorillas, and chimpanzees. But they were not spiritual beings made in God’s image. That position—and all of the intellectual, relational, and symbolic capabilities that come with it—remains reserved for modern humans alone.
  1. Darryl Fears, “Scientists Unearthed a Trove of 700-Year-Old Stone Tools—Used by Monkeys,” The Washington Post, July 11, 2016, https://www.washingtonpost.com/news/animalia/wp/2016/07/11/in-brazil-scientists-unearth-a-trove-of-ancient-stone-tools-used-by-monkeys/.
  1. Fazale Rana, “Chimpanzees’ Sleeping Habits Closer to Hominid Behavior Than to Humans,'” Today’s New Reason to Believe (blog), Reasons to Believe, June 9, 2014, http://www.reasons.org/articles/chimpanzees-sleeping-habits-closer-to-hominid-behavior-than-to-humans.


Subjects: Anthropology, Archeology, Hominids, Human Uniqueness

Check out more from Reasons to Believe @ Reasons.org

About The Author

Dr. Fazale Rana

I watched helplessly as my father died a Muslim. Though he and I would argue about my conversion, I was unable to convince him of the truth of the Christian faith. I became a Christian as a graduate student studying biochemistry. The cell's complexity, elegance, and sophistication coupled with the inadequacy of evolutionary scenarios to account for life's origin compelled me to conclude that life must stem from a Creator. Reading through the Sermon on the Mount convinced me that Jesus was who Christians claimed Him to be: Lord and Savior. Still, evangelism wasn't important to me - until my father died. His death helped me appreciate how vital evangelism is. It was at that point I dedicated myself to Christian apologetics and the use of science as a tool to build bridges with nonbelievers. In 1999, I left my position in R&D at a Fortune 500 company to join Reasons to Believe because I felt the most important thing I could do as a scientist is to communicate to skeptics and believers alike the powerful scientific evidence - evidence that is being uncovered day after day - for God's existence and the reliability of Scripture. [...] I dedicated myself to Christian apologetics and the use of science as a tool to build bridges with nonbelievers. Fazale "Fuz" Rana discovered the fascinating world of cells while taking chemistry and biology courses for the premed program at West Virginia State College (now University). As a presidential scholar there, he earned an undergraduate degree in chemistry with highest honors. He completed a PhD in chemistry with an emphasis in biochemistry at Ohio University, where he twice won the Donald Clippinger Research Award. Postdoctoral studies took him to the Universities of Virginia and Georgia. Fuz then worked seven years as a senior scientist in product development for Procter & Gamble.

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