A classic example of natural selection at work is the origin of giraffes’ long necks. The ancestors of modern giraffes were animals similar to deer or antelope, with necks of ordinary length.

Understanding this phenomenon allowed him to develop his concept of “natural selection” which, in turn, became a core element of his theory of evolution. Darwin observed that with such abundance, ...

Instead, a gerenuk can achieve its water requirements by consuming foliage. L. walleri exhibits several adaptations key to surviving the arid environments that it inhabits, including several ...

This suggests that natural selection may help limit cancer in wild populations. However, while the study highlights patterns ...

So the question is, why? How could an animal be so precisely adapted to a particular lifestyle? The answer is natural selection. See, what must have happened, is way back when the ancestors of the ...

This phenomenon, called multilevel selection, is an extension of natural selection: the process by which organisms ... to 16 years in some cases – and how many offspring individual animals had each ...

Aa Aa Aa Natural selection, genetic drift, and gene flow are the mechanisms that cause changes in allele frequencies over time. When one or more of these forces are acting in a population ...

Wild animals' usual wariness of human beings ... I remember thinking that this is natural selection in action, here before my eyes, and in Darwin’s islands!" A reminder: January 5 marks the ...

What does ‘survival of the fittest’ mean? In terms of evolution, an animal that is ‘fit’ is one that’s adapted to its environment. This concept is at the core of natural selection, although the term ...

To constitute natural selection, the difference in survival and/or reproduction cannot be due to chance, and it must have the potential consequence of altering the proportions of the different ...