i think a cheetah can.
Improved answer: actually cheetahs can only run for about 30 seconds i believe its a human :)
Snow Leperd
Tiger
Panda
Jaguards
White Bears
Lions
A Lion?
The most poisonous creature is the sea snake.
tiger shark
sharks
KOMODO dragon
most do but some maynot
A dorado
Piranna
No, the hexproof given by archetype of endurance will prevent your opponent from targeting your creature, however once a creature is enchanted the enchantment no longer targets.
certain species of sea snake
The most dangerous deep sea creature is the Sea Wasp. A deadly jellyfish. The slightest touch of their tentacles creates a permanent rash and horrible pain. Any harder and your toast.
single unicellular creature
dolphins