The review covers both offensive and defensive aggression in a variety of animal models including muricide (mouse killing), ranicide (frog killing), isolation-induced, pain-induced, brain stimulation-induced, and intermale aggression.

“In ten years, this is the most last-minute holiday season that we have ever seen,” a Citigroup analyst, Deborah Weinswig, tells ABC News.

Mr Smith's history classes are a total skive.

The New Caledonian crow is known for creating tools from plant material to capture prey hiding in cracks and crevices.