text: "Demersal elasmobranchs in the North Sea, Skagerrak and eastern English Channel"\nhttp://www.ices.dk/committe/acfm/comwork/report/2005/oct/demersal%20elasmobranchs%20NSSK.pdf\n\n"At least 12 species of rays have been reported from North Sea surveys, but only 4 of them are fairly common. Also 8 demersal sharks have been reported, of which only lesser spotted dogfish (Scyliorhinus canicula) is common."\n\n"Spurdog"\nhttp://www.waddenzeesites.nl/asp/getecomare.asp?hrec=1933180&srcdoc=ecomare.asp&language=english\n\n"The spurdog is the most common sort of shark in the North Sea."\n\n"Sharks"\nhttp://www.waddenzeesites.nl/asp/getecomare.asp?hrec=1922940&srcdoc=ecomare.asp&language=english\n\n"The shark species that are dangerous for man are rarely found in the North Sea. Those sorts live in tropical waters. Most of the common sharks in the North Sea are smaller species, such as the spurdog, the smooth hound and the lesser spotted dogfish."\n\n"Porbeagle"\nhttp://www.flmnh.ufl.edu/fish/Gallery/Descript/Porbeagle/Porbeagle.html\n\n"Porbeagles have been filmed making fast passes at divers on oil platforms in the North Sea without attacking. This is probably agonistic (defensive) or exploratory behavior."