English can also, of course, incorporate 1s and 0s and thus express anything that could be put into a computer (including a dolphin's brain, which is a computer). This would be horribly inelegant and slow, and I don't think it would ever come to that, but English is capable of doing it.
Just like a universal computer is quite a simple and minimal thing, so is a universal language. This is a common theme about universality: as soon as you start to get a reasonable amount of generality in a system, you often find you've reached universality even if you didn't intend to.
Universality will be discussed further in David Deutsch's upcoming book _The Beginning of Infinity_ which I highly recommend. The book also addresses the particular issue of the circumstances of evolution of our brain and whether that fundamentally limits us.
They're universal languages for people; for brains that specifically evolved to swing through trees, pick bugs out of our friends' fur, and to chase down antelopes. It's software that's pretty specific to the hardware.
What if we just don't have enough in common with a critter that evolved in a fully 3D environment with no hands?