What Spaniards rode an animal that the Aztecs and Incas had never seen before the .?

The Spaniards who rode horses were the first to introduce this animal to the Aztecs and Incas, as these civilizations had never encountered horses before the arrival of Europeans in the 16th century. The use of horses provided the Spaniards with significant advantages in mobility and warfare, impacting their conquests in the Americas. The sight of horses was both surprising and intimidating to the Indigenous peoples, who had only ridden llamas and other native animals.