Over the past two decades, the Gulf of Maine has become a popular landing spot for invasive species from across the world, ...

Though clione are called angels, they feed by extending their ... limacina helicina, a kind of sea snail. Therefore, the aquarium cannot give it to them, according to So Abe, a lead keeper.

this sea snail earned its nickname by behaving more like an insect, fluttering its wings from top to bottom and contorting its tiny body to propel itself upward through the water column.