Species can be recognized by their morphological characteristics and songs.

Islands are known to differ in the food supply available to ground finches, mainly seeds.

To summarize, the particular song a male sings, and the behavioral responses of females to song and morphological signals, are not genetically inherited in a fixed manner but are determined by learning early in life.

Evidence of epistasis from hybridization studies is more scarce.

Plumage features constitute a major component of courtship signals.

The theory of founder effects does not explain how novel features like plumage traits arise.

The process of speciation is completed with the cessation of genetic exchange.

Almost nothing is known from hybridization studies about the inheritance of courtship behavior of females, or of their responsiveness to particular male signals.

Males transmit signals in courtship through behavioral displays.

Thus mating of females was strictly along the lines of paternal song.

Species can be recognized by their morphological characteristics and songs.

Thus the genetic basis to the origin of bird species is to be sought in the inheritance of adult traits that are subject to natural and sexual selection.

We observe closely related species in sympatry and infer how they evolved from a common ancestor.

Genes that underlie the capacity to receive, use and transmit information are the evolving properties.

The divergence of songs in the new population away from those in the progenitor population would only be prevented if these processes were balanced by repeated immigration and subsequent breeding: song flow.

Closely related species of birds are also chromosomally similar.

Exchange of breeding individuals between two populations tends to homogenize their gene pools.

The independent role of morphology in mate choice is revealed by the rare instances where the usual association between song and morphology is disrupted.

I started recording because I was always complaining about the records that I was getting of my songs. At least if I did them and messed them up, I wouldn't have anyone else to blame.

Then I decided I couldn't just crawl in the corner and die, so I started putting pen to paper and wrote some songs. I had no idea what for or who I was going to work with. I tried to find my way and direction.

The things in my songs are the edited highlights of my life. I don't go seeking out strange sexual experiences every day of the week.

The way you look for songs, you find yourself looking for little signals and clues about life and how things are.

All my songs were solo voices. Just me singing. In fact, that was the gimmick - no gimmick. Just singing straight with not too much background.

It's part of the calling to at least do a few songs in the show that give people some hope. There's so much hurt in this world and... music is such a great healing balm and a great way to forget your troubles.

Again, I say I will be glad to tell what songs I have ever sung, because singing is my business.

My vocal ability is very limited, but I'm fortunate in that I can write the songs around my vocal limitations.

I've written many extra verses to songs that I learned to sing - an extra verse about a friend, or just add some verse - and that led to writing my own songs.

When I heard his first songs, Dylan was answering certain questions that I had all my life been asking myself.

The bands that wrote the big, heroic rock songs - I really wanted to make a record like that.

Every time the guys were knocked out by my guitar playing and the girls were knocked out by the type of songs I did. That set us apart from the average blues band.

This is an album of songs that I've always loved, tunes that I heard. For the first time in 53 years of recording, I really had control over an entire album, start to finish.

All my songs are where I am.

That's what I like to do, I like to make songs.

We would turn everything into songs in those days.

Sometimes, but the year I lived in France I started to write songs.

Writing songs has a therapeutic effect, and it either kills off love or wins the heart of the lover.

I had deeper, more reflective songs on the first album.

I don't think you need a record deal to write songs. You don't need any other reason than you want to do it. It's a far cry from why some people do music today. They make it to order, which is pretty horrible.

The process depends on the situation, and I don't think there are any two songs that have gone exactly the same way... well, actually, that's not true.

I didn't want my last chapter to be the guy who sits at the piano and sings love songs.

We had been working. We had a bunch of songs written and it came time to make the record, so we had our lawyer make the call to Elektra and ask for our advance. Then, we got dropped. It was actually exciting.

People assume that the meaning of a song is vested in the lyrics. To me, that has never been the case. There are very few songs that I can think of where I remember the words.

If you only do little clusters - three or four songs by one, and another, and then yet another - you lose the opportunity to think your way into the composer's mind, since, after all, most of these pieces are quite brief.

I remembered their songs but I had never owned a Beatles album.

I was growing up listening to Queen. Freddie Mercury threw those incredible melodies into his songs.

It can get a little costly if you try and leave it until then to write songs. But you're writing all the time. You're collecting songs. I've had songs that have been collected over a two-year period for my next record.

I must be careful not to get trapped in the past. That's why I tend to forget my songs.

I listened to Billie Holiday a lot in order to learn to sing. She remains one of the extraordinary jazz singers. But my intent is to become my own voice, to be able to interpret these songs in my own way.

If you look over the years, the styles have changed - the clothes, the hair, the production, the approach to the songs. The icing to the cake has changed flavors. But if you really look at the cake itself, it's really the same.