Springjacks are domesticated herd animals used by the Kithkin of Lorwyn. A springjack is a creature that has characteristics of goats, sheep, and rabbits. The springjack's wool is useful, its milk and meat are nourishing, and its gait is speedy. It's the perfect all-around beast of burden for Lorwyn's kithkin.
A springjack doesn't gallop like a horse; its gait is more of a bounding motion, like a hare. Kithkin knights certainly appreciate the saddle-maker's craft.
"Should you take it in mind to ride a springjack, remember: there are easier ways to fly, and harder ways to break your skull." -Lann of Cloverdell