A new study has found that slow-swimming sperm are disadvantaged by narrow areas of the female reproductive tract, preventing them from reaching an egg. Less active sperm may never have the chance to ...

When the world's first flower sprouted about 140 million years ago, it was bisexual, possessing both male and female reproductive parts, according to the researchers who virtually reconstructed the ...

Researchers have recently identified and described a new genus and species of xanthid crab found in Okinawa Island, Ryukyu Islands, Japan. Named Mabui calculus, it is the first among the 7,800 species ...