Here are 10 animals that have some of the highest levels of testosterone and the impact it has on their behavior and characteristics.

Male green treefrogs attract mates with loud calls, but new research shows parasites can subtly change those signals.

The debate over the future of zoos in the UK has intensified after the Green Party reaffirmed its policy calling for the abolition of traditional zoos.

Bone claws, oxygen-absorbing “hair,” and hands-on frog dads. Meet the hairy frog (or wolverine frog), one of nature’s strangest amphibians.

Scientists suggest female frogs listen for changes in the male calls as a signal for when it's warm enough to mate.

Are people allowed to feed wild animals in New Jersey? The answer, according to state law, largely depends on which animal is ...

Ethical tourism has been gaining traction for years. One of the attractions that has consistently made headlines for all the ...

These wetlands, these alligators ... it has to have some kind of monetary value,” said George Melancon, alligator research biologist for the Louisiana Department of Wildlife and Fisheries.

Decades after its release into the wild, a super-ageing, bone-crunching vulture called Balthazar reveals a major conservation ...

After 82 mule deer were culled over CWD concerns inside a high-fence ranch in Idaho, public records show it's just one of ...

For about three decades, beluga whales and bottlenose dolphins greeted more than a million annual visitors to Marineland of Canada. In the sprawling 162-hectare (400-acre) theme park, located a ...

A rare Hawaiian tree snail returns to the forest after decades of extinction in the wild, marking a key conservation milestone.