With Darwinian eyes he now studied every bird beak and eye stripe, hoping to reconcile anomalies in the natural world.

However, the three genera have the same characteristics in regard to their fruit, which resemble long bird beaks.

The genetic regulation of BMP4 provides the foundation for natural selection in bird beaks.

The mouth was like a gross bird beak, with several thin appendages enclosing it.

Also they were described as vaguely reptilian with bird beaks.

The illustration of bird beaks shows an obvious sign of their different ways of life.

The warriors wore headdresses made of bird beaks and animal fur.

They appeared to be made of keratin, the material in bird beaks and human hair and fingernails.

Then the sound of a hundred bird beaks pecking.

The beggar s toenails were like bird beaks.