Matching whales is fun :D

Do you know that science can be fun? playing around with dorsal fins and flukes can end up in a fortunate match of a well known individual seen in different locations or at different times.

Dolphins and whales are highly social mammals and their frequent physical interactions may leave permanent marks all over their bodies. Other accidents, like entanglements in fishing gears, when not lethal can also leave a visible memory. All these marks, especially if on dorsal fins and flukes are like finger prints and can help to tell apart single individuals.

Once individuals are identified they can be matched to find out that the same individual might have migrated a very long way between the cold highly productive subarctic waters and the warm subtropical waters or that it may have been missing few years in a specific area before being sighted again, maybe in the company of a calf 🙂

Being able to track individuals can, on a long term, give us information about its life history, site fidelity and movement patterns and the more individuals identified within a group the wider the picture we can get. Such information is not merely to satisfy the curiosity of scientists and marine mammals nerds, they are ultimately a valuable support for the conservation management of whales and dolphins populations.

During daily whale watching tours, Terra Azul collects sightings and photographic data with the aim of contributing to the knowledge and conservation of cetaceans in the Azores. This is a long-term regional project started in 2009 and counting on the partnership of a University research centre and local whale watching companies distributed on different islands. Data are then entered in an online database, which is open to the public ( The open-access characteristic of MONICET is considered crucial in that it allows the sharing of data among researchers interested in working for the wellbeing of populations, but also it contributes to create a link between the general public and science.

Citizens not only can have access to the database, but they can also contribute to it by sending their photos taken during regular whale watching tours. Few criteria, such as a right angle and a good resolution, are needed to make sure pictures are usable.

The local open access photo-identification catalogue can be found at


Matching can be quite exciting as it was when we find out that two humpback whales, which were seen in the Azores on the 17th of May of this year, have also been sighted off Tromsø, Norway, where they are included in the local photo-identification catalogue. One of the two individuals, the one with the darker fluke (see feature image) is also very well known in Cape Verde Islands where it has been seen during 2011, 2013 and 2017 seasons.

So, if you want to have fun and want to contribute to research and the conservation of these fascinating creatures, fell free to visit the MONICET site and don’t forget to take lots of pictures when you join your next whale watching tour!









Arianna Cecchetti

About Arianna Cecchetti

Arianna is a Marine Biologist and was Main Guide at TERRA AZUL since 2009, and Technical & Scientific Director until 2018. Originally from Italy, she sees herself more as a world citizen. Arianna deserves the very best, and we hope she can come back to share her passion for the sea with us again.

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