This is the dolphin equivalent to “bromance” … and “holding hands.” To strengthen social bonds, the male bottlenose dolphins caress each other with their pectoral fins. In addition to physical touch, the males swim in synchrony to keep their relationships solid.

Researchers from The University of Western Australia also discovered that the dolphins use individual calls or “names” to identify themselves, and they use their “names” to remember friends … and rivals. The dolphins remember who’s who, and prefer the company of some over others.