Instant Index: Proof Dolphins Are Highly Intelligent

Diane Sawyer reveals the top stories people have been buzzing about this week.
1:29 | 07/23/13

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Transcript for Instant Index: Proof Dolphins Are Highly Intelligent
Our "instant index" starts with a reminder we are not the only living things on earth with names. Scientists recorded the sound of one dolphin, then traveled out into the water and played it back. Listen. There it was and in the pod, that one dolphin turned around, answered back, swam closer. When they changed the whistle to a different one, another dolphin turned around. Proof dolphins come when they are specifically called. Baby dolphins need to hear their mothers for the first three years of life which helps dolphin moms round up the little ones who stray. This has happened to all of us, just as you're about to snap that photo, someone steps into the frame.Look, at disney world, the moment a couple gets engaged, that guy got in the way. Well, the image has gone viral and now that guy has been photo shopped into everything from the moon landing to the beetles walk across abbey road. By the way, his identity still a mystery tonight. Finally, talk about the sho must go on. Beyonce having a run in with a fan. We don't mean a cheering fan. Look, her hair got stuck in an electric fan but she keeps on singing. ♪ ♪ a team of stage hands rushed in, eventually freeing her from the rogue fan.

This transcript has been automatically generated and may not be 100% accurate.

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