It's possible to spot various species of toucan, parrots, lizards, and swarms of butterflies. Monkeys, tapir, raccoons, jaguar, and armadillo are also in the brush, but it's rare to see them during a day walk. There is a natural history museum in the park with information about the different animals. Also in the area are a number of fresh water pools and small cataracts. There are reports of a proposed train to the falls on the Argentine side, so people won't have to drive up to them, though nothing is running yet.
Buses are the easiest way to get to the falls from each of the countries.
The best time of year to visit the falls is around October and November, or March and April. Rainfall is abundant year-round, so come prepared to get a bit wet. Summer is the most humid and rainy, though it is still possible to visit. But you might have a problem with mosquitoes and bugs. Where to Stay Each country bordering the falls offers accommodations close by.