Ogri

The Ogri were a race of being from the Doctor Who Universe, resembling large rocks.

Physiology
On Earth, the Ogri looked like irregularly-shaped rocks, taller than a man. They were large, slow and heavy, as well as very durable. They glowed and produced a rumbling noise when active.

They left a trail of silicon dust, and would disintgrate into silicon if destroyed.

They fed off proteins, using the globulins in human blood to nourish themselves.

History
Three Ogri were taken to Earth by Cessair of Diplos.