Differences in the limits and range of aerobic activity levels between endotherms and ectotherms remain poorly understood, though such differences help explain basic differences in species' lifestyles ...

The sympathetic nervous system, which enables the fight-or-flight response, was thought to be present only in jawed vertebrates. Analysis of a jawless vertebrate suggests that this system might be a ...

New experimental research shows that muscle metabolic activity may be an important factor in the incredible longevity of the world’s oldest living vertebrate species – the Greenland shark. These ...