It seems to me that species that use echo location (dolphins, bats, slugs, cheese, politicians, etc) have been left out of these locative games.
So, I propose a series of headsets which fit on the aforementioned species, that have earplugs some kind of array of microphones and possibly two teeny
The headsets generates aural signals mimicking the target, the animals send out signals and if they squeak (or whatever) in the right direction (microphone array + gyros) they win and go on to the next level.
Actual useful porpoises are a bit thin on the ground...like you could use the bats to eat mosquitoes and finally get whales to realise that those funny swish-swish-swish noise is the whalers and bugger off post-haste.
I'm in condition tonight..