8. Red-bellied piranha
The red-bellied piranha is perhaps the most famous of the many perils faced by intrepid Amazonian explorers. After all what could be more frightening than to be eaten alive by a shoal of small fish? In fact, the fish can reach a length of up to 14 inches and fully grown specimens can weigh in excess of eight pounds, so they’re not tiny. The other secret about the piranha is that although it does display predatory behavior, it prefers to feed as a scavenger.
9. Poison dart frog
There are actually a variety of poison dart frog species in the Amazon, with each one apparently competing to see which is the most luridly colorful. In fact, as a rule of thumb, the more colorful the frog, the more venomous it is. The poison dart frog is generally small, less than an inch long, but some species can attain a length of 2½ inches. The frog excretes poison through its skin, so it will only kill you if you eat it.