@Ceili,
That's a great series - will try to watch that program as well.
Btw, if you or anyone else here has a fine ear (tone-deaf folk need not apply) he can try signing on to the dolphin-and-whale tracking project (link on top of page). All those orcas, other dolphins, pilot whales and so on being tracked, actually are known to other members of their groups by name - in their own language, naturally - which we finally figured out by listening to their calls and always getting a specific individual responding to a specific call.
There are many dimensions to signal processing for sounds (in addition to volume, tone, pitch, timber, direction, etc) and many sources of sound distortion underwater, so computer programs can't identify them all.