Which is the slowest animal in the world – and why do you think it evolved this way?

[Positivio]

I've always been curious about the extreme opposites in the animal kingdom. While the fastest animals get most of the attention, the slowest creatures are often overlooked. What animal do you think deserves the title of the slowest in the world? Should we judge slowness only by movement, or should reaction time and behavior count too? I'm really interested in your thoughts and which animal you'd nominate as the slowest on Earth.