"If humans descended from monkeys, how come there are still monkeys?" is one of the most frequently asked questions about evolution. It can be phrased in different ways, regarding smaller mammals, fish or basically any animal alive today that resembles any evolutionary ancestor, although the monkey example is most prominent as primates are the closest relatives of Homo sapiens and humans are primates themselves.
Some creationists ask questions like this thinking they've made a real zinger you can't possibly answer, and all of evolution thus falls apart. These have little interest in your answer, let alone in serious discussion of the issue. Other creationists, such as Answers in Genesis and Creation Ministries International, advocate that creationists should not use this question as an argument.
However, the question can also be asked innocently by those misinformed on the subject, as there are a lot of misconceptions about evolution. Some of these are caused by the subject being taught badly, and others are spread by creationists themselves, Harun Yahya being one of the worst offenders. So there's no loss in assuming good faith and examining why there are still monkeys, even though "humans evolved from monkeys".
 What is behind the question?
Most of the simple but common "arguments" against evolution stem from serious misunderstandings of the science and principles that underlie it. Exploring the confusion behind the question is a key point. "Why are there still monkeys?" involves two major errors:
- The psychological essentialism of folk biology. Research has shown that people (adults and children alike) tend to be "intuitive creationists." The phenomenon of psychological essentialism causes people not to engage in population thinking, but to lump all individual animals of a certain "natural kind" (in this case, monkeys) together as more or less identical. In this misconception of evolution, it is individuals that simultaneously "transform" rather than populations that evolve.
- Second, the question misinterprets evolution as a linear process: an upward-sloping line, like the old, pre-scientific idea of a "Great Chain of Being". This is a simple way of viewing evolution and changes are easily visualized in a linear fashion — the famous picture of human ancestors walking behind each other is a prime example. However, this traces just one twig of a much more complicated tree of life.
- This question also seems to assume that a "monkey is a monkey", that whatever occurs to one kind of monkey also occurs to every monkey. If one monkey loses its tail and stands upright, will that occur to every other monkey as well? If one kind of cat loses its tail and becomes a Manx cat, we don't wonder why there are still cats with tails. Monkeys are no different.
Many people are deeply reluctant to consider the possibility seriously, and treat it as asking "Do you want to be descended from a monkey?" But, of course, science and history are about what reality is and was, not what we would want it to have been.
There is also the related question: "If monkeys changed into humans, why aren't today's monkeys changing into humans?" Many people are under the mistaken idea that:
- evolution is finished;
- evolution states that one animal only evolves into the next animal — that if we started again, the exact same evolution would happen.
The reality is that evolution is still happening, even in humans over the past few thousand years. But evolution has a multitude of possible paths, with specific changes depending on the environmental pressures at any particular time. Evolution is not random, but is affected by random factors — the best results of those random factors are what survives.
 Serious answers
Key rebuttals address the misunderstandings behind the monkey issue:
- Evolution is the change in populations, not in individuals.
- Evolution is not a process in which species universally progress up a "ladder".
- Humans are not descended from any modern species of monkey; both monkeys and humans are descended from some long-extinct ancestor pre-dating both. Although this species, if it were transferred to today, would be considered a "monkey", it is not any living species of monkey.
- Evolution explains how humans developed from a primate ancestor, but not an extant species of monkey or ape. (Modern primates include: bonobos, chimpanzees, gorillas, baboons, macaques, lemurs, gibbons, and humans. None of these is a descendant of any other.)
- Speciation can occur by branching into two or more reproductively isolated populations (cladogenesis) or when a single population changes over time to such an extent that the later population is considered a different species (anagenesis).
 Disappearance of ancestors
The question assumes that ancestral forms must disappear as evolution takes place. This is not the case—species can often go millions of years with little in the way of change (hence "living fossils"). If an ancestral form is well adapted to a particular set of conditions (i.e. it "fits" an ecological niche) and these conditions do not change, then there is minimal selection pressure to drive evolution; this is what is really meant by "survival of the fittest". If a sub-population of this species migrates to a new habitat with new conditions (e.g., new food or a new predator) then selection pressure is placed upon it to evolve. As this sub-population evolves to fit a different set of environmental conditions, it may diversify enough to form a new species while the ancestral form stays relatively unchanged. But there's no rule that says the original species must go extinct to make way for the new one.
This sort of change drives much of evolution, with populations being split and forced by nature to adapt to new environments. Separation of this type often leads to one species splitting into two separate species. Indeed, it was observations of this sort that initially led Darwin to propose natural selection as the mechanism for evolution.
 Branching family tree of cousins
Some report success with the cousins analogy: species are extended groups of distant cousins with a long-dead (great-great-great-) grandparent. The current configuration of life is a snapshot of the living; the dead are long gone and no one wrote down the family tree, so we have to work it out from available evidence. Dawkins uses this analogy in River out of Eden. Asking If humans are descended from monkeys... is the same as asking If I am descended from cousin Bob, why is cousin Bob still alive?
 Complexity and intelligence
The question also seems to assume that evolution moves from more simple organisms to more complex ones. Given a simplistic view of evolution, it's easy to assume that humans are more complex than monkeys and that consequently "humans evolved from monkeys". But evolution is about adaptation, and this doesn't necessarily involve an increase in complexity — though increases in complexity are frequently the result of improved adaptation. While modern humans certainly possess intellectual skills far superior to those of modern monkeys, it is by no means clear that their common ancestor was less intelligent — or even more monkey-like — than the modern monkey.
Humans are only "superior" to monkeys in terms of intelligence, and the hidden assumption is that intelligence is a sign that we are the "most evolved". From our anthropomorphic point of view, this makes us superior. However, if we were to classify "most evolved" as meaning "most able to live in trees" then the pinnacle of evolution would be held by monkeys. One could choose any extremely evolved capability to make the same claim—an elephant's trunk for example.
 Socratic answers
You can try to elicit from the questioner what on earth the question means to them:
- Why shouldn't there still be monkeys?
They're probably thinking in terms of linear evolution working up a ladder of life, but the details may be of interest.
- Which species of monkey do you expect to be missing? How do you know there wasn't one that is actually missing now, having turned into us?
 Informal answers
A scientific or generalized explanation may be difficult for someone with a fundamental misunderstanding of evolutionary theory to grasp. An informal analogy may get the idea of non-linear evolution across:
- If white Americans and Australians are both descended from Europeans, how come there are still Europeans?
- If dogs are domesticated wolves, how come there are still wolves?
- If rock and roll came from the blues, how come there is still the blues?
- If Protestants came from Catholics, how come there are still Catholics?
- If Christians came from Jews, how come there are still Jews?
One of the most powerful ideas in evolution is that speciation is caused by physical separation. Just as Americans are separated from Europeans by the Atlantic ocean, species can diversify along different routes when isolated from each other. One may change dramatically, one may stay the same. There are still Europeans. There are still monkeys.
If this doesn't work (actual answer to the Europeans analogy: "But that's different."), then you may have some trouble getting the point across to this person.
 Joking answers
If you're quite sure the creationist doesn't care about your answer, then feel free not to take the question seriously — although one does run the risk of cementing even more misunderstandings about evolution, as these do resemble the straw man answers often put forward by creationists to mock evolution.
- When monkeys turned into humans, the gap was filled in by shrews turning into monkeys, lizards turning into shrews, salamanders turning into lizards, and so on down the line.
- Some of the monkeys, when given the choice, preferred to stay the same.
- If man was formed "of the dust of the ground" (Genesis 2:7), how come there is still dust?
- Variant: If man was created in the image of God, how come God still exists?
- It is not recommended that you joke about if woman came from man's rib (Genesis 2:21-22), how come man still has ribs. Too many people think that men are missing one rib.
 Troublesome answers
One of the very worst ways this question can be answered is to argue the definition of "monkey" or "ape", or whatever. "Ah, but humans are monkeys!" says the feisty evolutionist, thinking that they can get one up over the creationist by being clever. If the question is about fish it's even worse, as "fish" is a paraphyletic group.
The important thing is that the universe doesn't give a hoot what we call particular animals and how we group them. Names, clades, groups, species and sub-species are all human inventions designed to help group and classify animals. These are useful, and in scientific taxonomy (at least) are based on real properties, but they're not real distinctions. Actual evolution works on populations and individuals that comprise them; the fact that we like to break these up into groups is just a model, nothing more. Any discussion of what is and what isn't a monkey, ape or human in the context of the "why are there still monkeys" question would be to miss the point entirely. It nicely highlights how our definitions might be a little arbitrary when put next to reality, but this has little bearing on the misconceptions underpinning the fallacy.
 See also
- Accept It: Talk about evolution needs to evolve by Eugenie Scott (director of the National Center for Science Education) in ScienceNews volume 176 number 3 (August 1, 2009) page 32.
- ↑ Richard Dawkins mentions in his Channel 4 documentary Faith School Menace? that this is the most common question posed to him. He cheekily turns to the faith school's science teacher to answer (it wouldn't be a spoiler to say she fails), before answering it himself.
- ↑ Arguments we think creationists should NOT use (Creation Ministries International)
- ↑ If Humans Evolved from Apes, Why Do Apes Exist Today? Arguments Christians Shouldn’t Use by Dr. Tommy Mitchell Answers In Genesis
- ↑ Thinking About Evolution: Cognitive Factors That Get in the Way, Mixing Memory
- ↑ John L. Rudolph and Jim Stewart. Evolution and the Nature of Science: On the Historical Discord and Its Implications for Education. Journal of Research in Science Teaching, VOL. 35, NO. 10, PP. 1069–1089 (1998)
- ↑ Study Detects Recent Instance of Human Evolution (Nicholas Wade, New York Times, 2006-12-10) — the ability to digest milk as an adult, which developed in Europe 10,000 years ago and separately in Kenya 3,000 years ago.
- ↑ bacopa, comment, Why Evolution Is True, 2021-03-17
- ↑ Hat tip to "Bruce the Hoon" at PZ Myers' Pharyngula blog, comment dated May 28, 2011.
- ↑ This one apparently works quite well.
- ↑ Though Christians have tried to make this one less true over the past 2000 years.
- ↑ Work by Vesalius proved this to be wrong in the 16th Century after years of just assuming that men must have a missing rib because the Bible said so.