Nursery ships were saucer-like starships used as nurseries for transporting children across the galaxy. They could hold thousands of children and used levitation beams to transport them from a planet's surface to the ship.
After the Matron Cofelia had seeded and bred Adipose on Earth in defiance of the Shadow Proclamation in 2009, an Intergalactic Class nursery of the Adiposian First Family travelled to Earth to collect the ten thousand children marching in London. (TV: Partners in Crime)
In Donna's World, nursery ships appeared over every major city in the United States of America to collect a far greater amount of children born from the sacrifice of sixty million Americans. (TV: Turn Left)