Sorry, we couldn't find any results!
Please try a different filter above.
Never miss a Nat Geo moment
Join our curious community and you'll have access to some great features!
Personalised content reflecting your interests on the site
Watch exclusive videos before anyone else
Favourite content that you like or want to check out later
Free SMS and Email reminders so you never miss a show
Get notified when content that interests you is published
Share your photos on Snap! that could appear on TV
Share your thoughts and opinions on various matters
Receive a monthly newsletter with loads of great content
Not only is Zuul's armor preserved, but so are its soft tissues—including the osteoderms' furrowed sheaths of keratin, the protein that makes up rhinoceroses' horns and your fingernails.
Amelia Madill, a preparator at Research Casting International, painstakingly flakes excess rock off of the back armor of Zuul. Five technicians led by Madill have worked for a year to prepare the fossil. PHOTOGRAPH BY MARK THIESSEN
Amazingly, the bony plates that give Zuul its spikes fossilized in their original positions. Normally, these plates (called osteoderms) are found scattered, since they fell out of the skin as it decayed. PHOTOGRAPH BY MARK THIESSEN
Ankylosaurids are best known for their tails, which evolved into stiff sledgehammers capped with bony knobs up to two feet wide. Zuul's club may have helped it fend off predators or rivals within its own species, earning it the species name crurivastator—