Proving-disproving hypothesis

Is it harder to prove a hypothesis than to disprove it? Suppose you wanted to establish that cheetahs are fastest land animals, and suppose you’ve the ability to clock any animal moving at its top speed. Now, what would it take to disprove the idea that cheetahs are the fastest land animals? What would it take to prove that cheetahs are the fastest land mammals, meaning no other land mammal could run faster than they? Explain