The rainforests of South America contain the widest diversity of bats in the world.
03.19.25
By Paul Hormick
Bats have found ecological niches in wide ranging habitats throughout the world. And it is in the rainforests of the world that they especially thrive. The most abundantly found mammals in these thickly forested environments are bats. The rainforests of South America contain the widest diversity of bats in the world, home to insectivorous, frugivorous, carnivorous, and nectarivorous species.
The world’s three vampire bats species can be found throughout Central and South America (more broadly they range from southern Mexico to northern parts of Argentina and Chile.) One of the two confirmed species of bat to eat fish, the greater bulldog bat (Noctilio leporinus), lives in these environments as well. It is estimated that one tenth of all bat species can be found in the Amazon Basin, most of which are New World leaf-nosed bats (Phyllostomidae), the most ecologically diverse bat family, although their range also extends far outside the Amazon.
Ecuador may be the world’s bat capital, with two separate hotspots of rainforest bats. In 2008, a research team recorded around 50 bat species at Podacarpus National Park, a reserve in the southern portion of the country which is about 3,000 feet up in the Andean rainforest. The same research team recorded over 100 species of bats in a northern section of Ecuador within the Amazon rainforest. But Ecuador is not alone in its impressive bat species stats. One small island off the coast of Panama, for instance, is home to an impressive 76 documented bat species.
In an intriguing adaptation, some bats in the rainforests of Latin America, such as the Honduran white bat build their homes by fashioning leaves into tents using their sharp teeth.
Adaptive Dwelling
Throughout much of the world, bats make their homes in caves and abandoned mines. But caves in the rainforest can be few and far between, so bats will often shelter in the hollows of trees. And in an intriguing adaptation, some bats in the rainforests of Latin America, such as the Honduran white bat (Ectophylla alba), build their homes by fashioning leaves into tents using their sharp teeth.
While most bats are insectivores, rainforests have a high percentage of fruit-eating bats, who play an important ecological role as seed dispersers, particularly for pioneer plants. Scientists are investigating whether or not they can exploit this scat-spreading ability to reforest degraded areas of the tropics. Using chemical lures to attract bats to deforested spaces, these scientists demonstrated that frugivores may play a part in reseeding these areas and regenerating rainforests.
While most bats are insectivores, rainforests have a high percentage of fruit-eating bats, who play an important ecological role as seed dispersers.
Nectar-feeding bats usually rely on sight and smell to find their flowers, but one plant, a vine in the tropical rainforest of Cuba, attracts echolocating bats. The Marcgravia evenia has evolved concave leaves that surround its flowers, forming a structure that resembles a sonar dish and making an ideal bat beacon. The leaf-dish structure bounces back strong sound waves containing easily recognizable acoustic signatures of bats’ echolocation calls.
Owing to advances in collection and observation techniques, scientists are improving our knowledge of bats in Brazil. In all, they have found 186 species in the country. Despite this progress, much of Brazil’s rainforests remain remote, and bats in these regions have continued to be understudied. About 60 percent of Brazil’s territory has yet to have any survey or study of the bats that live there.
Other discoveries are being made throughout South America. Scientists have recently investigated migration of bats in Paraguay and have gained for the first time a generalized knowledge of the seasonal transitions of many of the bats in that country.
Deforestation
Deforestation has afflicted the Amazonian rainforest for generations. This conversion of forest to agriculture and other purposes decreases habitat for rainforest bats. The rainforest along Brazil’s Atlantic coast has had some of the greatest disturbance from humans since the arrival of the Europeans in the 15th century. From 1500 to now it is more than 70 percent of the original area that was destroyed or modified. The forests have been logged and much of the land has been converted to agriculture. Remaining forests are often fragmented into ecological “islands” surrounded by farms and development. Recent research found that the areas affected by human activity, the logged and agriculture areas, had fewer bat species than what was found in nearby forest. The good news is that the forest fragments had the same richness of bats as undisturbed forest.
The conversion of forest to farmland hurts bats in other ways. Farmers use agrochemicals, mostly pesticides and fertilizers, to boost the productivity of their crops. Agrochemicals often contain copper, manganese, lead, and other heavy metals that can persist in the environment. Analyzing hair samples, scientists found bats who live in agricultural areas had higher levels of lead and manganese than bats who live in forests. We don’t know how these substances affect bats, but in humans they can cause nausea, diarrhea, dehydration, vomiting, and other symptoms.
While these developments are concerning, Bat Conservation International is working throughout the world to protect rainforests and the bats who live in them. In South America, BCI is currently seeking to preserve 1,200 acres of forest and protect 66 caves to protect the highly endangered Antioquian sac-winged bat and 55 other bat species in the rainforests of Colombia. Your support of BCI aids this effort and other efforts to save bats in our rainforests and the rest of the world.
Paul Hormick, author of the environmental newsletter The Green Dispatch, has spent the last 22 years writing about music, food, and the environment.
