Four drowned mice.

Four drowned mice.
See where they swam.
See where they swam.
They climbed in the bucket to get a drink,
They paddled in circles 'til each did sink.
How long did they swim, what do you think?
Of four drowned mice?

Was this a mass suicide?, a sequential tragedy? Simple random drownings? How many were swimming at the same time? I guess it will never be known.
The bucket is there to catch water from an intermittently dripping faucet. In the past I found a mouse here, a mouse there, one time I saw two mice, but Four is unprecedented. I don’t think a better mouse trap needs to be invented, the mice at my house seem to take care of themselves.