Sightings of the marine mammal captivate the public and baffle scientists Charter boat captain Donna Piraino fishes twice a week for eight months of the year off the coast of Massachusetts. In and around the Stellwagen Bank National Marine Sanctuary, she’s seen a lifetime’s worth of species, from leatherback sea turtles and basking sharks to pilot whales and North Atlantic right whales, one of the most endangered marine mammals on Earth.