Biologists like to say that reproduction is the ultimate investment, a costly gamble that shapes everything from lifespan to ...

Epaulette sharks can reproduce without any measurable increase in energy use, stunning researchers who expected egg-laying to ...

New research reveals walking sharks reproduction involves no extra energy use, challenging long-held beliefs about marine ...

Meet the walking shark, a species of shark that can walk on land, survive low oxygen environments, and reproduce without ...

A large-scale analysis of 117 mammal species found that preventing reproduction is associated with longer lifespans, suggesting a strong link between reproductive activity and life expectancy. Why do ...

A study based on a review of genetic and health information from more than 276,000 people finds strong support for a decades-old evolutionary theory that sought to explain aging and senescence. A ...

The energy invested in animal reproduction is as much as 10 times greater than previously estimated when the metabolic load of bearing and caring for offspring is accounted for, according to a new ...