No answers in report on river whale

An expert group has released a report on the whale seen in the river in spring 2020, but they have no explanation why the animal strayed into a busy river that eventually proved fatal to it. For a sea creature adapted to saltwater the river wasn’t a congenial environment, but there’s no certain explanation why it didn’t survive.

If you wonder why we don’t know much about deep-sea creatures, imagine, this whale was right there, we don’t know why it came here, and we don’t know why it didn’t simply ride the river back down to the estuary. Do we even know whether it was male or female?