Here's a link to a a NOVA program about that very topic:
http://www.pbs.org/wgbh/nova/elegant/program_d.html .
Chapter 7 of the 2nd hour talks about the ants on the cable.
You can watch the whole three hours online.
That is a great online offering by Nova..I watch it periodically and pick up new things everytime...Well worth the bandwidth and time spent.
No thanks, ants creep me out! Besides, there is another thread floating around about ants who delight in torturing and dismembering their prey after designing an intricate trap to capture them.......... Ants have intelligence and need to be destroyed.