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"The Kandrona is a miniature version of the Yeerks' home sun. It emits Kandrona rays, which concentrate in the Yeerk pools. It is what nourishes the Yeerks. That is why the Yeerks must swim in their natural state in the Yeerk pool every three days – they need Kandrona rays."

Kandrona rays are the Yeerks' primary source of sustenance. They feed by absorbing them through their skin. Kandrona rays are beamed through a Kandrona ray/particle generators into the Yeerk pool, or on the Yeerk homeworld from the natural sun. Later it was revealed that the Iskoort also feed off of Kandrona rays. Yeerks and Iskoorts need to feed off of Kandrona rays every three days.

Andalite technology Dome Ship | Escafil Device | Hirac delest | Mirrorwave call | Z-space transponder | Morphing | Mag-Hover Truck | Quantum Virus | Shredder | Gleet Bio-Filter | Prion Virus
Yeerk Technology Anti-morphing ray | Dracon beam | Gleet Bio-Filter | Kandrona | Kandrona Rays | Nova-class Empire Ship | Pool ship | Blade ship | Mag-Lev Train | Hunter Robot | Yeerk Pool | Bug fighter
Ketran Technology Explorer | Time Matrix | Mapping Crystal Quadrant 3 | Uninet | Adge
Other Dropshaft | Ixcila (Arn) | Pemalite crystal | Pemalite ship | Skrit Na Saucer | Hawjabran Colony Ship | Hawjabran Freighter