Now that we've narrowed it down, let's zoom in on this section of the cladogram.
But is T. rex more closely related
the caiman or to the parrot?
We don't have enough evidence yet.
Let's examine three additional features:
1) the shape of the heel
2) bipedalism
3) number of digits
We will start by looking at the first feature, the shape of the heel in these three animals.