Today we had the chance to encounter all three our ‘resident’ species of dolphins: Common, Bottlenose and Risso’s Dolphins.
While Bottlenose Dolphins (Tursiops truncatus) were mainly feeding in the morning, in the afternoon the group was socializing near a large pod of about seventy Risso’s Dolphins (Grampus griseus). The two species often interact in São Miguel waters and this generally means that they can bite each other, and even hybridize! (you can learn more about this phenomena in our previous post here). However, these dolphins have totally different dentition, and rake marks – that’s how bite scars are called – can be discriminated.
In the picture below you can see an example of Risso’s Dolphin that had a really close encounter with a Bottlenose Dolphin! 😉
Rake marks can tell a lot about the social life of cetaceans! 🙂
Your thoughts on this?