The mere presence of a predator causes enough stress to kill a dragonfly, even when the predator cannot actually get at its prey to eat it, say biologists at the University of Toronto.
Oct 27, 2011 in Plants & Animals
Fear. You've been there: Your heart races, even jumps to your throat. Your hands grow clammy and your stomach churns. Your mind goes blank.
Jan 28, 2016 in Plants & Animals