Dolphins swimming off Sagitta's bow

Everyone enjoys seeing dolphins round their boat. And it seems catamarans attract more dolphins than monohulls. Presumably because the two bows are more fun to play with - and yes dolphins definitely play on the bow waves. We've seen two swim fast under the bridgedeck from port stern to starboard bow and vice versa, crossing underneath and seeing how close to the bow they could get. And we've seen the other dolphins clearly laughing at the one who hit our bow when cutting it too fine. That didn't happen this time, but here's a recent video taken when sailing our 30ft Sagitta catamaran from Fowey to Plymouth. Unusually for the English Channel it was clear, flat water so we could watch them easily.