Bottlenose Dolphin

Fun Facts

• Dolphin Name TagsEach dolphin develops its own unique signature whistle, essentially a name! They use these to call out to specific friends. Dolphins can remember these 'names' for over 20 years.
• Mirror Test PassersDolphins are one of only a handful of animals that pass the mirror self-recognition test, placing them alongside humans and great apes. In a 2001 study, two dolphins used a mirror to investigate marks placed on their own bodies.
• Secrets in the SoundDolphins communicate using unique signature whistles that function like names! Each dolphin develops its own distinct whistle, allowing them to identify and call one another, much like how we use names to socialize.
• Glowing Oceans, No Joke!Dolphins do not glow, but they can look like they do. Tiny plankton such as dinoflagellates flash blue when the water around them is disturbed. Researchers at sea have watched dolphins swim through them at night, lit up in a perfect outline of snouts, fins and tails, trailing light behind them like shooting stars.
• Names on a WatchlistIn a 2026 study, researchers played 17 wild female dolphins the vocal name tags of individual males and filmed their reactions by drone. Females who could conceive showed significantly stronger avoidance of the calls of males who coerced females more often. They seem to track each male's behavior over time, based on their own experience of him.
• Half the ConversationA dolphin isn't born with its signature whistle. Calves learn theirs within the first year of life, and once the pattern forms it stays stable for decades. Signature whistles also make up around half of all the whistles freely interacting dolphins produce, so identity really is half the conversation.
• The Deliberately Imperfect CopyWhen one dolphin copies another's signature whistle, it never copies it exactly. Researchers found copies differed from the original in an average of 4.4 acoustic features, which keeps a copy audibly a copy rather than an impersonation. Copying is also rare, and happens almost entirely between very close companions.
• Your Name, Minus the VoiceOff the coast of Scotland, researchers played wild bottlenose dolphins synthetic copies of their own signature whistles, built with the original caller's voice features removed. In 8 of 12 playbacks, the dolphins called right back. A dolphin's identity is coded in the whistle itself, independent of the voice that whistles it.
• Mirror BabiesTwo dolphin calves at the National Aquarium in Baltimore were tracked at a mirror over three years. One began showing self-directed behavior at 5.5 months old, earlier than human children usually manage (about 12 to 15 months) and much earlier than chimpanzees.