Re:Elephants give each other names – first non-human animals...
by morteify on Thursday November 16, 2023 @05:44AM
(#38287963)
There is a mention of dolphins in the article: "This makes them [elephants] the first non-human animals to address each other in a manner that does not imitate the receiver's own call, as dolphins and parrots do."
First link I came up with on a really quick search, dated 2013:
https://www.smithsonianmag.com/smart-news/dolphins-may-have-...