"TIL For millennia, Europeans did not know where birds went in Winter time. The mystery was partly solved in 1822, when a German hunter shot down a stork. The stork had a 80cm long Central African spear impaled in its neck. This provided the first evidence that they migrated to Africa."
I'm sure it was observed that there was a wide range in the amount of time living rats would be found in water after something that would have caused them to fall in.
To establish what mechanism was causing the disparity it would be extremely easy to test a rats reactions to different scenarios without actually killing the rat, not to say they didn't anyway though.
The point is that information relating to potentially extending survival time in a disastrous situation is among the most valuable things to study. Can you not recognize why that would be important to understand?