Formidable predators, dragons(also known as wyrms and drakes) are massive in size with fearsome teeth, deadly breath, vicious claws, and hides like stone. Dragons generally make their home in caves and mountains, far from humankind, but when they come close to people, their huge appetite is generally a source of conflict.
Mother cheetah and cub. The following from "Nature": Because the mother cheetah raises the cub alone the cub is vulnerable to predation by other carnivores on the African savannah, usually the lion and hyena, especially when she is hunting. Just as alarming, the mother cheetah may down its prey with tremendous speed, only to have the prey taken away by larger predators, typically lions, who travel in packs ("prides"). For more (great article), see: http://en.wikipedia.org/wiki/Cheetah
Pufferfish (Arothron stellatus?) by Jacopo Werther: Capable of surprising bursts of speed when pursued, a back up defense mechanism is to fill its extremely elastic stomach with water until it is much larger and almost spherical in shape. All puffers have pointed spines, so a hungry predator may suddenly find itself facing a highly toxic, pointy ball rather than a slow, tasty fish. http://en.wikipedia.org/wiki/Pufferfish #Pufferfish