[Not even other species are immune to the mirror's attraction.] They're now thinking that dolphins, as well as humans and higher apes, can recognize themselves in mirrors, ... One of the ways they figured this out was that dolphins like to have sex in front of mirrors. When they drift out of [eyesight] they stop the action and move back in front of the mirror.  -   Mark Pendergrast     Quotes
[Not even other species are immune to the mirror's attraction.] They're now thinking that dolphins, as well as humans and higher apes, can recognize themselves in mirrors, ... One of the ways they figured this out was that dolphins like to have sex in front of mirrors. When they drift out of [eyesight] they stop the action and move back in front of the mirror. Mark Pendergrast