Sandra Markle's Science Discoveries

Every year in Namibia, about two thousand zebras suddenly disappear from their grazing area along the Chobe River. Months later, the herd returns. Where do they go? And why? Thanks to satellite-tracking collars, scientists were able to solve the...

Late in 2013, snowy owls started showing up in places no one expected to find them—including Florida. What had caused so many of these majestic birds to leave their Arctic home and fly to southern Canada and the United States? Scientists quickly began...

Panamanian golden frogs aren't just cute, little, and yellow. They're also the national symbol of Panama. But they started to disappear about fifteen years ago. What's killing them? Could it be a change in their habitat? What about pollution? Might it...

Honeybees are a crucial part of our food chain. As they gather nectar from flowers to make sweet honey, these bees also play an important role in pollination, helping some plants produce fruit. But large numbers of honeybees are disappearing every...

Little brown bats do us a big favor. They eat huge numbers of insects! That helps limit the spread of diseases and the damage that insects do to farm crops. But in recent years, large populations of little brown bats have been dying off each winter....

Acclaimed science author Sandra Markle offers a fascinating look at Gobi bears—the rarest bears on the planet. These adorable animals face threats ranging from illegal gold miners to climate change. Find out more about these bears, which are...

Long ago, Nubian giraffes roamed wild across Uganda.Over time, as people constructed roads and towns, giraffe habitat and populations shrank. By 2016, nearly all of the country’s two hundred and fifty giraffes were grouped in one area within Murchison...

In 2007 only thirty Amur leopards remained in the wild. Scientists knew they needed to do more to help these big cats. However, details of the leopards' wild lives in their high-altitude forest home were still a mystery. With the help of new...

Golden lion tamarins are found only in Brazilian forests. These small, remarkable monkeys once had plenty of space to roam and claim family territories. But years of deforestation caused their numbers to shrink. They were in serious danger of becoming...

African penguins waddle around nesting colonies in lower numbers than ever before. Despite South African government efforts to protect the penguin colonies and their ocean fish supply, young penguins still struggle to survive. Fuzzy chicks waiting for...

Southern white rhinos are in trouble. For years, a rumor has been spreading that their horns can be used to cure cancer, and poachers have been targeting these gentle creatures. Sandra Markle takes readers behind the scenes to see how civilians,...

Top-selling science author Sandra Markle presents the story of whale sharks—the largest fish on the planet. Facing threats from commercial fishing as well as climate change, they were categorized as endangered in 2016. Find out how scientists are...

In the dark, Kristofer Helgen and a group of scientists peered up into the treetops of the Ecuadorian cloud forest. Staring back at them was a furry, four-legged creature. Could it be the mysterious, wild olinguito?Helgen had been studying the olingo,...

In the cloud forests of the Amazon Basin, scientists are installing extraordinary numbers of camera traps in the hopes of learning more about an elusive species—woolly monkeys.No one knows for sure how many woolly monkeys are left in the wild. But...