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 ...

Here’s what you’ll learn when reading this story: Chondrichthyan fishes—a group that includes rays, skates, chimaeras, and sharks—are thought to have energy intensive reproduction cycles due in no ...

This voice experience is generated by AI. Learn more. This voice experience is generated by AI. Learn more. Epaulette shark (Hemiscyllium ocellatum), a shark made famous thanks to their ability to ...

Biologists like to say that reproduction is the ultimate investment, a costly gamble that shapes everything from lifespan to behavior. Yet a small shark patrolling shallow reefs has just upended that ...

A large international study reveals that mammals tend to live longer when reproduction is suppressed. On average, lifespan increases by about 10 percent, though the reasons differ for males and ...