On a recent morning, we stopped by the Lincoln Park Zoo just before it opened to talk to Lincoln Park Zoo primatologist Steve Ross. Ross recently authored a study that examined the hunting behavior of zoo apes. Ross found that even the gorillas we think of as gentle giants have been known to catch a squirrel or a bird, and in at least one case, eat the prey. Ross told WBEZ’s Gabriel Spitzer that the idea for the study started with an observation of the chimps at the zoo.