Reproduction in the animal world does not always follow a fixed script. In several species, individuals shift their ...

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 ...

Animal reproduction and breeding encompasses the full spectrum of natural, assisted and genetic processes that underpin the perpetuation, improvement and conservation of species across diverse taxa.

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.

As much as 6 percent of people are intersex, having chromosomes, gonads, and/or genitals that do not fit neatly into a male or female category. For this and other reasons, human biology is not binary.

Animals possess circadian clocks, or 24 h oscillators, to regulate daily behavior. These typically take their cues from the periodic change of sunlight and darkness. However, many animals are also ...