Horned Strider
Bird horses, giant casso-ponies, horned striders, etc. are a species of large flightless birds native to [E] that have been domesticated and ridden by humans for hundreds of years. In recent years they've even been subject to some [genetic modification] to further specialize them for their intended tasks. And to give them cute little ears.
Striders are an independent and agile alternative to horses. They can't carry as much weight, but they are able to expertly navigate through any sort terrain with ease. They are highly intelligent and are great at assessing risks and accurately avoiding danger.
This individual has typical wild type coloration but they've been bred to have many different patterns.