An Atlantic bottlenose dolphin named Tanner glides just below the surface as he imitates the behavior of another dolphin at the Dolphin Research Center in Grassy Key, Florida on January 11, 2011. During the study Tanner, who wore eyecups to block his vision, was able to copy the behavior of the other dolphin without the use of vision. (AP Photo/Wilfredo Lee)
Tanner, right foreground, imitates the behavior of another dolphin, Kibby, left, as Emily Guarino, Administrative Director of Research, right, and Jane Hecksher, research assistant, look on at the Dolphin Research Center in Grassy Key, Florida on January 11, 2011. (AP Photo/Wilfredo Lee)
Atlantic bottlenose dolphin named Tanner is fitted with eyecups to block his vision by Emily Guarino, Administrative Director of Research during a study at the Dolphin Research Center in Grassy Key, Florida on January 11, 2011. (AP Photo/Wilfredo Lee)
Tanner, foreground, imitates the behavior of another dolphin, Kibby, rear, as Emily Guarino, Administrative Director of Research, right, and Jane Hecksher, research assistant, look on at the Dolphin Research Center in Grassy Key, Florida on January 11, 2011.(AP Photo/Wilfredo Lee)
Tanner, foreground,mimics, Kibby, rear, at the Dolphin Research Center in Grassy Key, Fla. on January 11, 2011. (AP Photo/Wilfredo Lee)