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

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 ...

Quite an advantage in today’s world.

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

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

Climate change has a wide range of effects on wildlife. It affects seasonal migration, reproduction times, body size and mass ...

The improvements in animal care that have led to the aging population problem are laudable, but must now be accompanied by ...

Breakthroughs, discoveries, and DIY tips sent six days a week. Terms of Service and Privacy Policy. Motherhood is entirely possible at the age 74—for some birds at ...

Many mammal populations in European and North American zoos are aging—a trend that jeopardizes the long-term viability of so-called reserve populations and, with it, a core mission of modern zoos in ...

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