Reproduction

There's no such thing as a biological clock for female mole-rat queens, which don’t experience a drop in fertility as they age. Now new discoveries about their remarkable reproduction may help prolong or boost human fertility.

A striking study published in 2017 reported a 50% decline in the average sperm count since the 1970s. Now, a follow-up study is suggesting the decline in sperm counts is accelerating. But not all researchers are convinced the data is as clear as it seems.

It has long been known that insects such as bees help plants reproduce, by spreading pollen from one plant to another. Now, however, a similar arrangement has been discovered in the undersea world – involving red algae and tiny crustaceans.

Scientists have developed first-of-a-kind "Xenobots" from frog cells with the ability to self-replicate, a technology that could find use in regenerative medicine and and reveals a type of biological reproduction never before observed in science.

The California condor is one of the rarest birds in the world, but nature may be giving the species a leg-up. Scientists have found two condor chicks born from unfertilized eggs, in a form of asexual reproduction that’s extremely uncommon in birds.

A proof-of-concept study is suggesting epigenetic biomarkers in a father's sperm can predict how susceptible their offspring will be to developing ASD. The research is still in preliminary stages requiring further investigation in larger cohorts.

The oldest known animal sperm sample has been discovered, dating back 100 million years. Dozens of ostracods were found in a piece of amber with their “soft parts” out, and their giant sperm measuring around a third of the animals’ body length.

Scientists have tapped advanced 3D microscopy and high-speed cameras to shed new light on swimming sperm, upending the centuries-old perception they propel themselves forward by moving their tails side-to-side like an eel.

A team of US scientists has just solved a long-standing biological mystery – how exactly do millipedes mate? Using a variety of novel imaging methods, including microscopic ultraviolet photography and micro-CT scanning, the research finally figured out how these tiny creatures get it on.

An observational study has linked fish oil supplements with improved semen quality and testicular function in healthy men. The research can't prove causation, however, it does echo research reaching similar conclusions in men with fertility issues.

A new species of microscopic worm found in Mono Lake in California is able to survive huge doses of arsenic, and is divided into three sexes.

Scientists are trying to save the northern white rhino from extinction, using artificial insemination.