Ibridi eggs were artificially created by the Science and Research Center in Ark City to see if they could cross both a cat and dog creature.
The Ibridi is both a cat and a dog at the same time. One meows, while the other barks.
Since each creature only has two legs, it must rely on the other creature's leg for mobility and movement. This requires Ibridis to be very good communicators with their other half, although some of it is natural as they can sometimes but not always read each other's thoughts.
An Ibridi that is disagreeing with its other half is not an Ibridi that you want to be around! The phrase "Don't be such a distraught Ibridi!" has become popular around Ark for describing citizens who are not at peace with themselves.