Voracious Craw

Voracious Craw were wormlike creatures first encountered by the Tenth Doctor on Tiermann's World (PROSE: Sick Building).

Biology
Craws resembled tapeworms, growing to huge sizes and easy to mistake for a continent when viewed from space. Craws were always hungry, and would eat anything, be it animal, mineral or vegetable. In its eating habits, anything below the mouth of a Craw was pulped and channelled into the mouth itself, but the Craw did not actually touch the food (PROSE: Sick Building).

When a Craw arrived at a planet, the first thing that it did was check to see if another Craw had arrived there first. If one had not, the Craw devoured everything on the planet that it could. If it met another Craw, the larger one was left to feed and the smaller one departed (PROSE: Sick Building).

The disturbance of a Craw moving sent technology haywire (PROSE: Sick Building).

History
A Craw arrived at Tiermann's World, beginning to devour the planet and heading for the Tiermann family home, the only settlement on the planet. The Tenth Doctor, Martha Jones and Solin Tiermann exploited the ability to model the sound of a larger Voracious Craw by playing back and distorting human burps, and used this technique to trick the Craw into believing another, lager Craw was inhabiting the planet, and scare it away (PROSE: Sick Building).

Behind the scenes

 * The cover of Sick Building shows the Craw with teeth but this is not so.
 * Voracious means "ravenous" or "greedy".

Voracious Craw