I took this photo while visiting Assateague Island National Seashore in Berlin, Maryland, on June 14. My original plan was to get a good picture of the wild horses, but I didn’t get any I liked. I was ...

You wouldn't want to encounter an angry crab -- but as well as brandishing and snapping their claws, scientists have discovered that crabs can also "growl" in a show of aggression. Researchers at the ...