P ronghorn antelopes are the fastest land animals in North America, clocking speeds of up to 55 miles per hour for a half mile, and 45 miles per hour for longer. Since they mostly run in response to ...

The charismatic, robust, and impressive North American mountain sheep is losing its habitat to industrial mining, the changing climate, and human activity. And unless action is taken to protect this ...

Add Yahoo as a preferred source to see more of our stories on Google. On Saturday we showcased the extraordinary speed of North American pronghorn, with footage that showed the animals easily ...

During the Ice Age, North America was home to a bear far larger than today’s grizzlies. Standing taller and built heavier, this predator occupied the top of the food chain. Fossil evidence shows it ...

Fun fact: Almost all owls have eyes that are proportionately large to their heads for increased visibility during low-light hours, but the Great Gray Owl's peepers are especially big—roughly the size ...

Fifty thousand years ago, North America's landscapes were alive with an astonishing array of enormous creatures. Massive woolly mammoths roamed vast icy plains, while dense forests echoed with the ...

Have you ever wondered what the largest snake in North America is? Perhaps you’re interested in snake facts or curious to see if you share a state with one of these giants! North America is home to a ...

(Gary Braasch / Corbis) When Polynesians arrived at the uninhabited Hawaiian Islands thousands of years ago, they found an array of colorful tree snails, each less than an inch in length, across the ...

As people across the Houston area enjoyed a "once in a generation" winter storm Tuesday, so did some of the animals at the Houston Zoo. While some of the animals elected to stay warm inside enclosures ...