Figure 2From: Which person is my trainer? Spontaneous visual discrimination of human individuals by bottlenose dolphins (Tursiops truncatus)During the test trial (different-clothing condition), two persons appeared from behind the panel and walked along the poolside, in a leftward or rightward direction. In this trial, the dolphins’ main trainer walked in a rightward direction. Human faces are blurred for privacy (photos courtesy of Masaki Tomonaga).Back to article page