Tyrans are near-humans that evolved from mammalian herbivores. They are very similar to humans in Physiology, but tyran DNA is not compatible with human DNA.
Their skin is light tan and their eyes are a featureless black. Tyrnas have flat noses, elongated skulls (which houses a large brain), small mouths, earholes instead of ears, and their skin is drawn tightly across the bones.
All Tyrans have Nightvision.
The Tyrans were founding members of the Star Federation.