Risso's dolphin
Short-beaked common dolphins occur in large numbers in Northern Portugal. Dolphins show themselves by porpoising and bowriding along with boats just off the city of Póvoa de Varzim, where fishing activities occur. Alive or dead discarded fish while fishing can be easily caught by dolphins, which could help explain this relationship in the city's waters. The OMARE Marine Observatory also identified the Risso's dolphin and the Atlantic bottlenose dolphin in local waters. Stranded whales and dolphins and found dead occur with some frequency, natural causes, rough seas events, incidents with ships or fishing boats can explain these events.