Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Any domino can knock over another object up to 1.5x its size. The 32nd object would be big enough to knock over the Empire State Building.
18
Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
42
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13