Wyverns are kin to dragons, although they do not breathe fire. Varieties include brindled wyverns, swamp wyverns, brownbellies, and shadow-wings.
Wyvern Point in northern Sothoryos is named after the creature, which hunts above its swamps and jungles. Septon Barth wrote about them in Dragons, Wyrms, and Wyverns: Their Unnatural History, and speculated that Valyrian bloodmages may have created dragons using wyvern stock.
The sigil of House Vyrwel of Darkdell depicts a wyvern. The castle of Dragonstone includes wyverns among its stone gargoyles.