I realize you can just answer, “mysterious aliens beyond our understanding,” but why would a space probe have a mandate of either talk to a whale for 30 seconds or destroy Earth and disable everything in its path on the way to Earth?
Why? What does that achieve?
It’s been a minute for me - did they ever establish that it absolutely had to be whales or were whales just sea creatures that qualified?
What if this thing was sent to harvest water from planets lacking intelligent cetaecian life forms like humans might harvest a resource from an “uninhabited” world?
Not did it just have to be whales, it had to be humpbacked whales. And don’t ask me why they couldn’t fake it.
Space whales would know. You know they would.