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

Why mature size, hair shedding and calving ease must anchor your breeding objective if you want profitable, low‑input cows.

American folk hero Buffalo Bill Cody poses with taxidermy deer, antlers, and revolvers against a backdrop, 1871. Note: Image ...

Scientists suggest female frogs listen for changes in the male calls as a signal for when it's warm enough to mate. Pacific tree frog (Pseudacris regilla) male calling with vocal sac inflated, Conboy ...

Dramatic landscapes and rich biodiversity characterize Alaska’s unique environment. Alaska is the only US state with ...