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Are the Galapagos finch beaks evidence of Darwinian evolution?

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Were you taught in biology class that the changing lengths of finch beaks was a good proof of Darwinian evolution? Many students were… but is it true?

Jonathan Wells has an article about it at Evolution News.

It says:

When Charles Darwin visited the Galápagos Islands in 1835, he collected specimens of the local wildlife. These included some finches that he threw into bags, many of them mislabeled. Although the Galápagos finches had little impact on Darwin’s thinking (he doesn’t even mention them in The Origin of Species), biologists who studied them a century later called them “Darwin’s finches” and invented the myth that Darwin had correlated differences in the finches’ beaks with different food sources (he hadn’t). According to the myth, Darwin was inspired by the finches to formulate his theory of evolution, thoughaccording to historian of science Frank Sulloway “nothing could be further from the truth.”

In the 1970s, biologists studied a population of medium ground finches on one of the islands in great detail. When a severe drought left only large, hard-to-crack seeds, 85 percent of the birds perished. The survivors had beaks that were about 5 percent larger than the average beak size in the original population. The biologists estimated that if similar droughts occurred once every ten years, the population could become a new species in only 200 years. In a 1999 booklet defending evolution, the U.S. National Academy of Sciences called the finches “a particularly compelling example” of the origin of species.

But after the drought, birds with smaller beaks flourished again, and the average beak size of the population returned to normal. No net evolution had occurred. No matter; Darwin’s finches became an icon of evolution that is still featured in most biology textbooks.

In the 1980s, a population of large ground finches, with larger beaks than the medium ground finches, migrated to the island. When a drought in 2004-2005 again reduced the food supply, the medium and large ground finch populations both declined. But since even the largest beaks among the medium ground finches were no match for the beaks of the large ground finches, the latter pretty much monopolized the larger seeds and the former had to make do with smaller seeds. This time, the medium ground finches that survived the drought had beaks that were smaller than the average size in the original population. Biologists studying the finches argued that birds with smaller beaks were better able to eat the tiny seeds that were left after the large ground finches ate the big ones, and they concluded that this was again an example of “evolutionary change.”

[…]Wait a minute. Average beak size increased slightly during one drought, only to return to normal after the rains return. Then average beak size decreased slightly during another drought. A region of DNA is correlated with beak size. And somehow that tells us how finches evolved in the first place?

There is an important distinction to make between micro-evolution and macro-evolution. Changes within a type is micro-evolution. Evolving a new organ type or body plan is macro-evolution. There is plenty of evidence for micro-evolution, but no evidence for macro-evolution.

What needs to be proven by the Darwinists is that the same process that results in different average beak size in a population of finches after a drought can create the finches in the first place. I think that Darwinists are credulous – they believe what they want to believe because they want to believe it, even if the evidence is incredibly weak. Darwinists must demonstrate that heritable variations can result in the generation of new organ types and body plans. Changes in average beak size is not interesting. What is needed is to show how the beaks, much less the wings, evolved in the first place.

Icons of Evolution

Jonathan has actually written about a number of  misleading things that you may mind in Biology textbooks.

Here are the sections in his book “Icons of Evolution“:

  • The Miller-Urey Experiment
  • Darwin’s Tree of Life
  • Homology in Vertebrate Limbs
  • Haeckel’s Embroys
  • Archaeopteryx–The Missing Link
  • Peppered Moths
  • Darwin’s Finches
  • Four-Winged Fruit Flies
  • Fossil Horses and Directed Evolution
  • From Ape to Human: The Ultimate Icon

Dr. Wells holds a Ph.D in Molecular and Cell Biology from the University of California at Berkeley.

News

William Lane Craig explains the doctrine of penal substitutionary atonement

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Probably one of the most common questions that you hear from people who don’t fully understand Christianity is this question: “why did Jesus have to die?”. The answer that most Christians seem to hold to is that 1) humans are rebelling against God, 2) Humans deserve punishment for their rebellion, 3) Humans cannot escape the punishment for their rebellion on their own, 4) Jesus was punished in the place of the rebellious humans, 5) Those who accept this sacrifice are forgiven for their rebelling.

Are humans rebellious?

Some people think that humans are not really rebellious at all, but it’s actually easy to see. You can see it just by looking at how people spend their time. Some of us have no time for God at all, and instead try to fill our lives with material possessions and experiences in order to have happy feelings. Some of us embrace just the parts of God that make us feel happy, like church and singing and feelings of comfort, while avoiding the hard parts of that vertical relationship; reading, thinking and disagreeing with people who don’t believe the truth about God. And so on.

This condition of being in rebellion is universal, and all of us are guilty of breaking the law at some point. All of us deserve to be separated from God’s goodness and love. Even if we wanted to stop rebelling, we would not be able to make up for the times where we do rebel by being good at other times, any more than we could get out of a speeding ticket by appealing to the times when we drove at the speed limit, (something that I never do, in any case).

This is not to say that all sinners are punished equally – the degree of punishment is proportional to the sins a person commits. However, the standard is perfection. And worse than that, the most important moral obligation is a vertical moral obligation. You can’t satisfy the demands of the moral law just by making your neighbor happy, while treating God like a pariah. The first commandment is to love God, the second is to love your neighbor. Even loving your neighbor requires you to tell your neighbor the truth – not just to make them feel good. The vertical relationship is more important than the horizontal one, and we’ve all screwed up the vertical relationship. We all don’t want God to be there, telling us what’s best for us, interfering with our fun. We don’t want to relate to a loving God if it means having to care what he thinks about anything that we are doing.

Who is going to pay for our rebellion?

The Christian answer to the problem of our rebellion is that Jesus takes the punishment we deserve in our place.

However, I’ve noticed that on some atheist blogs, they don’t like the idea that someone else can take our punishment for us to exonerate us for crimes that we’ve committed. So I’ll quote from this post by the great William Lane Craig, to respond to that objection.

Excerpt:

The central problem of the Penal Theory is, as you point out, understanding how punishing a person other than the perpetrator of the wrong can meet the demands of justice. Indeed, we might even say that it would be wrong to punish some innocent person for the crimes I commit!

It seems to me, however, that in other aspects of human life we do recognize this practice. I remember once sharing the Gospel with a businessman. When I explained that Christ had died to pay the penalty for our sins, he responded, “Oh, yes, that’s imputation.” I was stunned, as I never expected this theological concept to be familiar to this non-Christian businessman. When I asked him how he came to be familiar with this idea, he replied, “Oh, we use imputation all the time in the insurance business.” He explained to me that certain sorts of insurance policy are written so that, for example, if someone else drives my car and gets in an accident, the responsibility is imputed to me rather than to the driver. Even though the driver behaved recklessly, I am the one held liable; it is just as if I had done it.

Now this is parallel to substitutionary atonement. Normally I would be liable for the misdeeds I have done. But through my faith in Christ, I am, as it were, covered by his divine insurance policy, whereby he assumes the liability for my actions. My sin is imputed to him, and he pays its penalty. The demands of justice are fulfilled, just as they are in mundane affairs in which someone pays the penalty for something imputed to him. This is as literal a transaction as those that transpire regularly in the insurance industry.

So, it turns out that the doctrine of substitutionary atonement is not as mysterious or as objectionable as everyone seems to think it is.

Polemics

Poll: few Millennials describe belief in God as “very important”

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Beliefs of millennials and boomers
Beliefs of millennials and boomers

I saw a very interesting article that compared the attitudes of young people about things like patriotism, religion, freedom, etc. The numbers are very discouraging.

So, here’s the article from the Washington Examiner:

The importance of patriotism, faith in God, and having children is significantly lower among millennials and Generation Z, compared to previous generations.

In a new poll conducted by the Wall Street Journal and NBC News, nearly 80% of people aged 55-91 said being patriotic is important to them, while only 42% of millennials and Generation Z, or those aged 18-38, said the same. Thirty percent of millennials and Generation Z said religion was important, compared to the over 75% of baby boomers, with just over 30% of millennials and Generation Z saying it was important to have children.

Areas where the younger generations had placed higher importance compared to boomers were tolerance for others and self-fulfillment, with financial security being almost tied between the two age groups.

I’m sure that everyone has seen other polls showing the decline of Christianity, especially in mainline and Catholic churches. Evangelicals are declining less, but they are still declining.

The reason I linked to this post is because I’ve noticed that some Christians don’t really think that there is anything to be concerned about. Everything is working fine, they say. Whatever we’re doing right now must be working, because there is no decline. We’re winning, and if you think otherwise, then you’re just complaining.

Well, I don’t really know why there is this decline, all I can do is speak from my experiences. I’ve met people through my blog who did lose their faith in college, and I’ve met ex-Christians in my office, too. I asked them what the problem was, and it seems to be that when they were growing up, they often bullied into behaving like a Christian without being able to ask any questions about whether it was true. And then as soon as they got to college away from their parents and pastors, they just dumped the whole thing.

I remember listening to an amazing lecture a while back by Dr. Scott Waller. I think it was a lecture he gave for the Stand to Reason “Masters Series in Christian Thought” in 2003. The lecture was about Postmodernism in the University. Postmodernism is the view that there are no true or false views, especially with “soft” issues like religion and morality. In the lecture, he talked about how a father had sent his devout Christian son to university, and the son had returned an atheist after one semester. I remember Dr. Waller quoting the son telling his parents “I have come to think of my time growing up in this house as the dark period of my life”. The father was very upset. So Dr. Waller told him what to do. He said, you’re going to need to read a few books on the most common questions that your son has, and then work through the answers with him. And he made a little pile of books about common questions that college students ask, and pushed the pile across the table to the father. And the father pushed the books back across the table to Dr. Waller, and said “well, I don’t have time for reading so many books… but could you just talk to him instead?”

Another thing that seems to cause a lot of young people to  leave the faith in college is sex. Now if I were trying to convince someone to be responsible about sex, I’d try to show them studies and statistics to explain why there really are best practices to relationships and marriage. For example, I’d might show them that the number of premarital sex partners increases marital instability, or that sliding into cohabitation early tends to make marriages less stable. But this takes a bit of work, and you have to work through it with the young people. I just don’t know if parents really reason with their kids like this. But in churches, I’ve noticed that trying to make an argument using evidence isn’t very popular. To me, if I were trying to be convincing to someone about something, I would use evidence. It’s just natural to me to make a case if I’m trying to be persuasive. But making a case just hasn’t been a really big priority in the churches I’ve attended.

So, I guess if I had to give any advice to parents of children, or pastors in churches, it would be that Christianity is in decline, and we need to do more than just order people to memorize Bible verses and creeds, go to church, etc. It’s hard for me to know what’s really going on in everyone’s home, and in everyone’s church. But I don’t think that whatever we’re doing in our homes and churches is working to convince young people that belief in God is very important.