In a new camera trap survey in the world’s most biologically diverse landscape in Bolivia, researchers for the Wildlife Conservation Society (WCS) have identified more individual jaguars than ever before.
Using technology first adapted to identify tigers by stripe patterns, WCS conservationists have identified 19 individual jaguars by spot patterns in the rainforests of Bolivia, a record number for a single camera trap survey in the country. The animals were identified from a total of 975 photographs, a record number of images due to the use of digital cameras as opposed to camera traps that use film.
The images come from the Alto Madidi and Alto Heath, a region at the headwaters of the Madidi and Heath Rivers inside Bolivia’s outstanding Madidi National Park. The survey also included Ixiamas Municipal Reserve, created following a previous WCS survey in 2004 along the Madidi River, which revealed a high abundance of jaguars and other species such as white-lipped peccaries, spider monkeys, and giant otters.
“We’re excited about the prospect of using these images to find out more about this elusive cat and its ecological needs,” said WCS Conservationist Dr. Robert Wallace. “The data gleaned from these images provide insights into the lives of individual jaguars and will help us generate a density estimate for the area.”
The study is noteworthy in its use of digital camera traps replacing the traditional film units used in the past. The cameras are strategically placed along pathways in the forest and especially the beaches of rivers and streams for weeks at a time, snapping pictures of animals that cross an infrared beam. Now, researchers returning to the traps can download the images in seconds, rather than waiting days for film to develop. Before embarking on a second field trip to the even more remote Heath River, Bolivian jaguar field biologist Guido Ayala noted that “series of digital images also capture more data than traditional film.”
“The preliminary results of this new expedition underscore the importance of the Madidi landscape to jaguars and other charismatic rainforest species,” said Dr. Julie Kunen, Director of WCS’s Latin America and Caribbean Program. “Understanding the densities and ranging habits of jaguars is an important step in formulating effective management plans for what is arguably the most biodiverse landscape on the planet.”
Madidi National Park is one of the top tourist attractions in Bolivia and is the centrepiece of a continuous chain of six national protected areas in north-western Bolivia and south-eastern Peru, one of the largest such complexes in the world. WCS works to develop local capacity to conserve the landscape from a variety of threats, including the negative environmental impacts from poorly planned development such as road construction, hydroelectric projects, logging, and agricultural expansion. WCS also works to improve local livelihoods through community enterprises.
WCS has worked to protect jaguars for decades and launched the WCS Jaguar Conservation Program in 1999 to assess the needs of jaguars in the wild and to minimize potential conflicts with humans.






The capybara (Hydrochoerus hydrochaeris) is the world’s largest rodent. According to Animal Planet, it’s South America’s “super-rodent,” not surprising as adult capybaras can weigh up to 65 kg (140 lb), and measure about four feet in length, about the same as a medium-sized dog. The scientific name, ‘Hydrochaeris,’ is a Greek word meaning ‘water pig.’ But its resemblance to a pig ends there. Its narrow face results from the placement of its eyes, ears and nostrils at the top of the head. This arrangement allows it to rest in the water with most of its body underwater – a useful adaptation to avoiding predators. Remaining in the water also helps the animal keep an even temperature, presumably preserving energy that would otherwise be needed to regulate body temperature. The capybara’s body resembles a giant guinea pig, lacking a tail, with raised, wide hindquarters and narrow shoulders. Capybaras have reddish-brown fur on the upper part of their body that turns yellowish-brown underneath. Like all rodents, the capybara sports a large pair of front teeth. These give it a rather goofy appearance when it opens its mouth.
Margays are among the most beautiful and mysterious of the spotted cats. A largely arboreal species, they are midway in size between the ocelot (Leopardus pardalis) and the oncilla (Leopardus tigrinus). Their soft, plush coat is brownish yellow through tan, with black spots, stripes and blotches arranged in longitudinal rows, and is longer than that of the other spotted cats. The centre of each spot, or rosette, is slightly paler, but still darker than the ground colour of the fur. The belly, chest, throat, chin, and insides of the legs are a snowy white. On the margay, as on the ocelot, the fur turns forward in the nape region, and the hairs on the neck are directed towards the crown. They have two dark cheek stripes on each side of the face. Their tail, as in many arboreal mammals, is very long, as much as 70% of the body length, and marked with broad rings, and a black tip. The backs of the large, rounded ears are black with a white central spot. Their eyes are enormous and dark brown.
Pygmy marmosets are one of the smallest primates, and the smallest true monkey, with its body length ranging from 11 to 15 centimetres not including the tail, which is 17-22cm in length. Males weigh around 140 grams, and females only 120 grams. They are native to the rainforest canopies of western Brazil, south-eastern Colombia, eastern Ecuador, eastern Peru, and northern Bolivia.