A New York Zoo offered a sneak preview of some of the artwork that will be available at its upcoming gala auction: creations by animals including penguins, giraffes, sloths, capybaras and others.

Under the painting of a Spanish sculptor is the outline of a woman, according to new infrared images. The artwork will be ...

The scale invariance in branch diameter dictates how much smaller a limb should be as it branches and how much investment a ...