Opinions expressed by Forbes Contributors are their own. I write about the world of biology. Life on Earth is anything but predictable. For evidence, look no further than the five mass extinctions ...

Imagine creatures that have survived since the time of dinosaurs. Species like the tuatara, sturgeon, crocodile, hagfish, ...

Between climate change and the effects of humanity on the environment, many species have been harmed. Here are a few of them ...

Less than 5 percent of the animal species in the seas survived ... the killer responsible for the largest of the many mass extinctions that have struck the planet. The most famous die-off ended ...

Sharks have been around for hundreds of millions of years, appearing in the fossil record before trees even existed. But what did they evolve from, are they 'living fossils', and how did they survive ...

While many of Earth’s earliest life forms have long since gone extinct, some animals have stood the test of time–surviving through mass extinctions ... design that has survived through ...

The Earth is now in the midst of its sixth major animal (and plant) extinction. The last mass extinction—approximately 65 million ... threatens spectacled bears in South America. Animals who survive ...

However, something survived the devastating bomb ... The trees, also known as "living fossils," have weathered the ice age, mass extinctions, and thousands of environmental changes the Earth ...

Nearly a quarter of animals living in rivers ... Since 1500, at least 89 freshwater species have been confirmed extinct, with another 178 suspected of disappearing. Since 1970, 35 percent of ...