The logic gates are a connectable agent included with Creatures 3. It allows you to use Boolean logic to create your connectable agent setups. The AND gate is shaped like a semi-circle, and the OR gate is shaped like a crescent moon.
The AND gate will take two inputs and produce one output. It will only send an output if it receives two signals.
The OR gate will send an output with the strength of 255 if either of the two inputs gets a signal.