The lion's worst enemy might come as a surprise, as the culprit is the size of a small dog: turns out the porcupine is the thorn in the big cat's side, or rather mouth, as a lion tricked into sniffing the clever porcupine's sharp quills often ends up with one or more stuck in its jaw for life.
Wildcat is any of the many kinds of small, undomesticated cats. Wildcats are native to nearly all parts of the world, but the name is usually applied to the European wildcat and to the North American bobcat.
Jaguar, the largest cat of the Western Hemisphere. It resembles the leopard, but is larger and has a somewhat shorter tail.