Re: Pigeons
Memory density on flash drives is sufficiently good to actually be able to get good overall throughput on a homing pigeon. The birds can average over 90 mph, and rack up 700 miles in a day source. A 45g terabyte memory stick shouldn't be a problem. The RFCs [1] [2] might need a bit of updating, though.
Latency is a bit of a bugger, and "packet" loss can be catastrophic.