Some individuals surviving better than others.

Some individuals have different colours.

Charles Darwin came up with the idea.

We sort of look like a mixture of our parents.

Lighter moths have a better chance at survival.

Darker moths have a better chance at survival.

They will become bigger.

They will become stronger.

They will become lighter.

They will become darker.

The darker ones that stand out.

The lighter ones that stand out.

The middle colour ones.

It became more red.

It became more light to stand out.

It matched the colour of the rocks.

Because of selective breeding.

Because the ones that were camouflaged survived and had babies.

Because they can change their colour to match.

It can camouflage and hide against the colour of the rocks.

It will stand out and be eaten, so it can't pass on that colour to its offspring.

It will have many babies and the sandy colour will spread through the next generation.

Survival of the best-suited to the environment.

Being able to change yourself to stay alive.

Survival of the tallest and funniest.

Rabbits will eat the best foxes.

The foxes will eat the fastest rabbits.

The foxes will eat the slowest rabbits.

The foxes will eat the rabbits at random.

They will be fluffier than the generation before.

They will be faster than the generation before.

They will be bigger than the generation before.

They will be darker than the generation before.