Animal behavior
As the ancestors of penguins dived deeper, their wings became streamlined for swimming.
Ancient 2-meter tall theropods could have outrun most humans.
New research suggests the birds must sense Earth's magnetic field using some other part of their anatomy.
Experiments showed how cats can track their owners by listening for their voice
Fox-like dog described by first Europeans to visit the remote islands was an ecological anomaly.
What nature's most complex constructions can tell us about how the brain organizes behaviors.
A new paper examines how elephants work together to solve a task and when cooperation breaks down.
Scientists identified competing neural pathways that control flies' decision making.
The carnivores play a unique role in breaking down calcium, phosphorous from prey.
Experiments on fox squirrels show they know the perfect combination of speed, springiness and "parkour movements" to get their nuts.
Photographers snapped images of the red-eyed insects emerging after 17 years underground.