Many other kinds of rat traps are inhumane and make the animals suffer. For instance, glue traps, illegal in many places, don't kill the rodents straight away. Rather, the animal dies slowly from dehydration and exhaustion. Rat poison slowly kills the animals, sometimes taking as long as three days. And even snap traps don't always kill the rodent straight away, but may snare them by a limb and leave them suffering.
This bucket trap is a humane way to catch rodents. The rat or mouse harmlessly falls into the bucket and can't get out. Later, you can terminate any caught animals humanely. Or you can take the bucket to a spot far from your home and release the animals there.