Closely related species of birds are also chromosomally similar.

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.

It's just a job. Grass grows, birds fly, waves pound the sand. I beat people up.

Most of the birds of the Old World can be found here, as Oman is on a strategic route for migrating birds.

What birds can have their bills more peculiarly formed than the ibis, the spoonbill, and the heron?

Be grateful for luck. Pay the thunder no mind - listen to the birds. And don't hate nobody.

I can scarcely manage to scribble a tolerable English letter. I know that I am not a scholar, but meantime I am aware that no man living knows better than I do the habits of our birds.

I spent a lot of money on booze, birds and fast cars. The rest I just squandered.

One must ask children and birds how cherries and strawberries taste.

In Kenya you've got the great birds and monkeys leaping through the trees overhead. It's a chance to remember what the world is really like.

When we seed millions of acres of land with these plants, what happens to foraging birds, to insects, to microbes, to the other animals, when they come in contact and digest plants that are producing materials ranging from plastics to vaccines to pharmaceutical products?

Make no mistake about it. These are not 'kookie' birds. Right now the greatest player, the big tent on the political scene in America, is called the Tea Party movement.

The structure of a play is always the story of how the birds came home to roost.

I am decidedly of the opinion that in very many instances we can trace such a necessary connexion, especially among birds, and often with more complete success than in the case which I have here attempted to explain.

There are joys which long to be ours. God sends ten thousands truths, which come about us like birds seeking inlet; but we are shut up to them, and so they bring us nothing, but sit and sing awhile upon the roof, and then fly away.

The parish I live in is a very abrupt, uneven country, full of hills and woods, and therefore full of birds.

Feathers predate birds.

The desire to fly is an idea handed down to us by our ancestors who... looked enviously on the birds soaring freely through space... on the infinite highway of the air.

I used to have this little mouse. I buy birds from the pet store and I let them go.

Having done something like The Thorn Birds gives you enormous longevity. You can keep picking and choosing the roles for a bit longer.

It's a warm wind, the west wind, full of birds' cries.

Consider the birds. Be wise as serpents.

Use those talents you have. You will make it. You will give joy to the world. Take this tip from nature: The woods would be a very silent place if no birds sang except those who sang best.

I can find God in nature, in animals, in birds and the environment.

As much as I converse with sages and heroes, they have very little of my love and admiration. I long for rural and domestic scene, for the warbling of birds and the prattling of my children.

Birds are a miracle because they prove to us there is a finer, simpler state of being which we may strive to attain.

Whores don't live in company of poor men, citizens never support a weak company and birds don't build nests on a tree that doesn't bear fruits.

The moment a little boy is concerned with which is a jay and which is a sparrow, he can no longer see the birds or hear them sing.

It is not only fine feathers that make fine birds.

Birds have wings; they're free; they can fly where they want when they want. They have the kind of mobility many people envy.

I realized that If I had to choose, I would rather have birds than airplanes.

Birds sing after a storm; why shouldn't people feel as free to delight in whatever remains to them?

Did St. Francis preach to the birds? Whatever for? If he really liked birds he would have done better to preach to the cats.