my money is on the bird. Once again....it's probably cheaper to live in the stone age and send info via birds than what it is to use our own national internet connectivity.
Telkom will point out that this is a homing pigeon, meaning that you have to get it first from its home to the point where the data to be transported is attached.
Measuring one way only is cheating, and the data transfer is subject to weather conditions. No night time deliveries either.