Rurrenabaque is the starting point for holidaymakers planning an eco-tour to the Amazonian pampas and jungle. This little frontier settlement, perched between the surrounding jungle and the River Beni, is the loveliest of the Bolivian lowland villages. A trip on the river in a dugout canoe is an unforgettable experience, while the rainforest in Madidi National Park and surrounding Pampas is abundant in wildlife and many holidaymakers come to see anacondas, capybaras (the world's largest rodent), monkeys, turtles, macaws, caymans, piranhas, and even to swim with the pink dolphins. The tapir and armadillo are difficult to spot, often deep in the impenetrable tangle of the jungle, but there is plenty of bird life to be seen and heard. The rainforest is known for its immense biodiversity, ranging from mountain cloud forest to dry tropical forest, humid lowland rainforest to savannah, to wild rivers and lakes.