| abstract | - Tryods were nine feet tall and had leathery bodies with fine, golden hair which grew most verdantly in the centre of their foreheads, their backs, and their legs. They had very long teeth and claws and leathery tails. On the back of their necks was an obvious protrusion. It was an organ which secreted a healing fluid when they were injured. They could only be killed by damaging this organ, which otherwise could resuscitate them, no matter what the injury. Even during the Doctor's first encounter with them, when they were considerably less evolved, Tryods were capable of showing mercy. Though they apparently could not talk at this juncture, they did display the ability to rise above a primitive killing instinct. The Doctor witnessed one refrain from biting another's healing organ, despite having been victorious in battle. When the Doctor revisited them, thousands of years later, they were fully able to talk. They were known to eat at least some types of lichen found in caves.
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