Without status updates and hashtags, these ocean dwellers—named for their yellow hues—actively keep in touch with and transfer knowledge between themselves and other sharks, according to scientists with the Bimini Biological Field Station, which is located in the Bimini Islands (map), near the Bahamas.

“They basically have friends,” said Tristan Guttridge, a behavioral ecologist at the station. “They have individuals that they prefer to follow and have social interactions with.” (See another picture of a lemon shark in the Bahamas.)

Social living is a common practice within the animal kingdom that provides well-known evolutionary advantages. For instance, thanks to multiple eyes on the lookout for food and predators, animals that stay together often have higher