How come you can reach the leaves and I can't? I am starving.
Let me tell you about natural selection my friend.
I have a mutation which causes me to have a longer neck, so I have a greater chance of surviving when the environment changes.
When you can't reach the leaves you will starve. They call it the survival of the fittest.
But I'm more fit than him...
When the environment changes we need to be able to reach the higher trees in order to survive. Since I was born with a longer neck I will have offsprings with a longer neck than the earlier generation.
So you're saying I'm gonna starve to death because I don't have a long neck?