A bumblebee and a unicorn.
Volvox is a type of microbe. A microbe is a living cell that is so small, you can't see it with your naked eye. It is a type of Algae. But you have to admit, Volvox sounds pretty funny. See also Science.
Vinegar Eels are tiny microbes that swim around in, obviously, vinegar! A microbe is a living thing so small, you can't see it with your naked eye.
Dude. Do us a solid. Add your own funny animal.
A half-zebra, half-donkey.
A swarm of mongoose.