Thrayonlosa was a doe that escaped with the other Efrafan does in the book. She received a wound from a low bridge while the rabbits escape from Efrafa on the boat. She is comforted by Hyzenthlay after her injury, but sadly, she died that night from her wound. She was the first of the does to die on the journey to Watership Down as another doe died later from a fox attack.

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