I want to make a cat robot.

A robot that basically has the same mental processes as a cat.

It'd have little visual sensors and things that would track movement and then it'd investigate the movement and if it decided that the movement was small and rapid enough it would pursue said movement.

I also want to genetically engineer a creature that tries to kill itself when it gets hungry.

So that you basically have to always feed it or it'll try to break its own neck.

I'd let it die.

It'd be like it gets its wires crossed for "extraordinarly depressed and suicidal" and "a bit peckish".