Like a slick, gray torpedo, a dolphin breaks the water's surface and leaps into a graceful arc. Its shiny skin glistens in the sunlight, just before it dives deeply again. Marine and river dolphins are highly social mammals that live in groups called schools in oceans and rivers...
Like a slick, gray torpedo, a dolphin breaks the water's surface and leaps into a graceful arc. Its shiny skin glistens in the sunlight, just before it dives deeply again. Marine and river dolphins are highly social mammals that live in groups called schools in oceans and rivers...