Smaller Than a Dime, Frog Is World's Tiniest Vertebrate. Paedophryne amauensis has taken the top spot as the world's smallest vertebrate, with an average adult size of millimeters in length, less than half the diameter of a U.
This is the world's smallest working aquarium, which holds just two tea spoons of water and measures just 30 mm. wide by 24 mm. high and 14 mm. deep, can be held in the palm of your hand. It is so small there is only room for these baby zebra fish.
The Worlds Smallest Automatic Umbrella - Hammacher Schlemmer - Carried inconspicuously in a purse or trouser pocket, this is the smallest umbrella available that opens and closes with the push of a button.
World’s Smallest Horse: cm tall. But even for the breed Thumbelina is particularly small: she is thought to be a dwarf-version of the breed. At just 60 lb and tall, the five-year-old Thumbelina is the world’s smallest horse.