A quirk in a bird's hunting behavior has given scientists a rare chance to measure an evolutionary force
in action in the wild.
An ancestor of the howler monkeys had apparently matched the gene duplication that Old World monkeys experienced, yet the evolutionary force
preserving the new opsin doesn't appear to have been an advantage in gathering fruit.
To compare three theories of what evolutionary force
drove the development of such firepower, Weiss set up challenges for groups of silver-spotted skippers, a species in which a caterpillar builds a series of shelters out of curled leaves and silk lines as it grows.
Instead, Nature was seen as an evolutionary force
that led to endless cycles of alternate creation and destruction.
Researchers previously did not know what evolutionary force
could have caused such changes.
Interbreeding between species is proving to be a powerful evolutionary force
, says Daniela Palmer, an evolutionary biologist at the University of Chicago.
So are we now 'free' from nature and the evolutionary force
of natural selection?
Antibiotics may be the most powerful evolutionary force
seen on this planet in billions of years," according to microbiologist Stuart Levy.
In order to convincingly prove that the survival instinct, commonly regarded as the physiological basis of representing arts, became the major evolutionary force
, the author of Ghosts of Theatre and Cinema in Brain reaches for the latest empirical and therapeutic theories of neurobiology and evolutionary psychology.
As these clumsy tetrapods slowly became more mobile and terrestrially comfortable, their efforts to move more efficiently became an evolutionary force
It is no small irony, then, that some kind evolutionary force
blessed me with a shortcut to weight loss on Wednesday.
In particular, he shows how collective action can be an important evolutionary force
through which organizations and populations can reshape their environments.