Wyvern locomotion

"Wyverns are the oldest flying dragons, and also the most agressive. Much of their danger lies in their flight, and their tendancies to drop upon unsupecting victoms in the deserts, mountains, and canyons where they make their homes.
Conventional wisdom holds that once a wyvern is grounded it is helpless, but this author has seen with his own eyes the fallacy of this remark.
Wyverns are well able to hunt and kill on the ground, and they are suprisingly agile and swift. With wing fingers folded tightly, they gallop along with horrible speed. They are also able to leap and slash with wing claws, and flatten to pursue prey into narrow canyons and caves.
Prospective dragon hunters should take note of this, and should not assume that his grounded quarry is helpless."

Length: 22 feet
Height: 6 feet at the shoulder
Wingspan: 33 feet

---Exerpted from Trismagistus, Late 19th century