The Snallygaster is a dragon-like creature known to exist in the New World. It has been featured in many Muggle newspapers and is so well-known that it competes with the Loch Ness Monster.
The part-bird, part-reptile is a distant relative of the Occamy. It cannot breathe fire, but uses fangs made of serrated steel to slice through its prey. It's naturally curious and has a bulletproof hide. Snallygaster heartstrings can be used as Wand cores.
Around 1620, Isolt Sayre and the Pukwudgie, William took trips together to observe these creatures and fought a Snallygaster. Snallygaster heartstrings can be used as a wand core, as evidenced by Isolt Sayre and James Steward when they created wands for early Ilvermorny students.
Its natural curiosity, coupled with a bulletproof hide has led it to repeatedly threaten the International Statute of Wizarding Secrecy. The Snallygaster has appeared in Muggle newspapers so often that it competes with the Loch Ness Monster for the title of 'Most Publicity-Hungry Beast.' Starting in 1949, the Snallygaster Protection League has been stationed in Maryland to Obliviate Muggles who see it.