WALKER THOMAS: We did a complete echocardiogram, so we looked at all aspects of his heart with two-dimensional echo color flow and Doppler. 

[ULTRASOUND MACHINE HUMMING] 

And that way we can evaluate his chambers. We can evaluate his blood flow. We can evaluate all hemodynamics and make sure that everything is working the way it should. And there's no changes from last time. Similarities between a gorilla echocardiogram and a human echocardiogram are indistinguishable. It would be almost impossible to tell just by looking at an echo, if it's from a gorilla, or if it's from a human.