![](https://www.aimmportugal.org/wp-content/uploads/2021/02/rissos_dolphin_2.jpg)
![](https://www.aimmportugal.org/wp-content/uploads/2021/02/3dd78e_d3798f96d0744409bc9ec5ef5f2bde3fmv2_d_5846_2343_s_21.png)
Scientific illustrations: © 2021 Haruyoshi KAWAI
Weight
Up to 500 kg
Length
Up to 4m
Threats
Bycatch, direct hunting, overfishing and pollution.
Behaviour
Shy, slow swimmer but agile.
Group
Usually 5 to 10, but occasionally larger gatherings.
Diet
Cephalopods and krill.
Conservation Status
Mainland PT
Life Span
At least 30 years
Diving depth
At least 220m
Diving time
Up to 30 minutes
![](https://www.aimmportugal.org/wp-content/uploads/2021/10/Especies-Marinhas_Guia-de-Bolso.png)
Find out more about the marine megafauna in Portugal with the official AIMM Species Guide.
The Species Guide is a digital guide in English where you’ll find various information about the marine species that occur in mainland Portugal. You’ll find biological information, behavior, conservation status and much more!
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