Airborne marine biologists were amazed by the sheer abundance and diversity of large marine wildlife in their recent aerial survey of the Northeast Canyons and Seamounts Marine National Monument, the only marine national monument on the East Coast, about 150 southeast of Cape Cod. Scientists with the Anderson Cabot Center for Ocean Life at the New England Aquarium documented more than 600 animal sightings in just four hours, including a “superpod” of about 250 common dolphins and a rare sighting of a giant manta ray.