Efficient lungs and respiration may have helped, new research suggests

Genetic tree shows surprising diversity, suggesting many efforts to tame wild steeds

Study: Neurotic men with neurotic dogs appear to be magnets for each other

Robotic devices equipped with electronic sensors, laser detection and ranging

Findings add to growing evidence that virtually all animals can suffer

Panel of experts says finding a volunteer community is best way to ease U.S. problem

Provisions suggest welfare of birds in afterlife was important to priests performing  embalming

Caterpillar's 700-ton trucks with have robotic drivers haul up to 240 tons

Skull of 13 million-year-old fossil found off coast of Peru