Clip description Keywords
Evolution of the animal eye
Evolution of the animal eye

Duration: 2:30

Darwin had difficulty with his Theory of Evolution when considering the origin of the eye. A description of the evolution of different eye types in animal species.

 
Mass extinction in numbers
Mass extinction in numbers

Duration: 02:00

A brief history of extinction on planet Earth.

 
Natural selection and survival of the fittest
Natural selection and survival of the fittest

Duration: 2:01

What did Darwin mean by the terms 'natural selection' or 'survival of the fittest'? Darwin's description is illustrated by the hunting of a gazelle by a cheetah.

 
Population size and control - predators and prey
Population size and control - predators and prey

Duration: 1:26

In the absence of predators, what happens to the size of a prey population? Mice can reproduce in large numbers without population control.

 
Sexual selection
Sexual selection

Duration: 2:30

How did peacocks and stag beetles evolve characteristics to increase their chances of mating? Darwin suggested they evolved by sexual selection.

 
The story of extinction and the age of the Earth
The story of extinction and the age of the Earth

Duration: 04:34

An animated history of our understanding of extinction and the age of the earth.

 
Thomas Fairchild, speciation and evolution
Thomas Fairchild, speciation and evolution

Duration: 06:43

Thomas Fairchild was the first to artificially cross two plant species and produce a 'new' plant.

 
Variation and inheritance
Variation and inheritance

Duration: 02:05

What did Darwin think about variation within species? An excerpt from 'On the Origin of Species' describing butterfly variation as an example of species in the process of formation.

 

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