These “walking sharks” can lay eggs without spending extra energy, rewriting what scientists thought they knew about reproduction.

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 ...

Quite an advantage in today’s world.

A new study shows there is a high cost of parenthood, quantifying the 10% “longevity tax” on reproduction. Consequently, mammals that have fewer or no offspring tend to live longer. But why does ...

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

New research shows that epaulette sharks, often called “walking sharks,” can produce eggs without increasing their overall energy use.