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

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

While most animals manage to avoid inbreeding through scent recognition or by leaving their packs, others (such as those ...

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

Quite an advantage in today’s world.

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

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 ...

In India’s harsh deserts, spiny-tailed lizards subtly change diets with seasons, storing energy for winter and shifting food ...

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 ...