Bitstream

The preferred method of communication between drones is through bitstream. They do have speakers and microphones, but why use sound when you have the internet?

— Halora, reminiscing on First Contact

The bitstream is a constant stream of ones and zeroes that convey messages over the internet setup throughout Clara. This is basically the only method of inter-drone communication: while they can speak to humans or birds, they prefer to use the internet for each other.