Animals’ appearances are shaped by factors that include biological, environmental, and social pressures. Typically, animals ...

Darkness stretched across the mountains of northern Peru, coaxing a golden-eyed creature out of its hiding place. It perched on a leaf and made a “peep-like” sound. Suddenly, a beam of light cut ...

University of Adelaide researchers discovered monotremes use a completely different sex determination system than other ...

An older study published in the Journal of Ultrasound in Medicine measured the average liver diameter of more than 2,080 male and female participants between 18 and 88 years old at the ...