Reddit, if you could have any creature scaled to fit in the palm of your hand, what would you pick? Why?

Assume you would have to keep it alive in the environment it's used to.

^(You would need to keep your pocket whale suitably moist!)

You can scale up if the idea of giant insects is your bag.

Edit: Your palm-sized creature would have the same attributes you would expect from its full-size counterpart, to scale.