Sentences with phrase «beak shape changes»

If beak shape changes, he reasoned, it might mean that the bird can't sing the same old song — just as a flute and a tuba sound different.

Not exact matches

Among his strongest points is that observations that demonstrate gradual evolutionary changes in specific characteristics (beak shape of finches, color of forest moths, for instance) do not establish how gradual changes could bring about major evolutionary transitions that require concerted functioning of many specialized organs — such as the change from arboreal mammals to night - flying bats, or the origin of life.

Adaptationism certainly appears to hold true in microevolution — small - scale evolutionary change within species, such as changes in beak shape in Galapagos finches in response to available food sources.

The Grants have shown «evolution in action» as generations of finches living on the various islands respond to dry or wet conditions bye changing the shape and function of their beaks as respond to drought or normal conditions.

The team found that the most unusual beak shapes often emerged over relatively short periods and therefore involved exceptionally fast evolutionary change.

The shape of the beak is linked to the shape of the skull, and these birds can't change one without changing the other.