Monty has been certified as a therapy dog in both the U.S. and the U.K., where he formerly worked as a rat-catcher in a horse barn. Courtesy of Yale University hide caption

itoggle caption Courtesy of Yale University

Do I Know You? An animatronic baby Tyrannosaurus Rex gives students a close look during a preview of the Australian show Walking With Dinosaurs in Melbourne last week. Mark Dadswell/Getty Images hide caption

itoggle caption Mark Dadswell/Getty Images

Nighthawks are known for their repeated "peent" call as they hunt for flying insects. Bill Bouton/Flickr hide caption

itoggle caption Bill Bouton/Flickr