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.

OZARK, Mo. — An endangered Ozark hellbender raised by the Saint Louis Zoo has successfully reproduced within the Current River. This is a significant milestone in the recovery efforts of the species, ...

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.

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 ...

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.