Wyvern and more as dangerous beasts smaller, weaker, and less intelligent than dragons. While a fantasy dragon often has a breath weapon, such as fire, wyverns rarely have such abilities and are more feared for their ferocity and sharp teeth and claws. Wyverns are sometimes associated with poison, either in the form of venomous fangs or poisonous breath, but this trait is not universally represented and may be a more recent addition to the lore based on the gila monster. A wyvern will typically be unable to speak, while a dragon often does have that ability. The wyvern features frequently in
Mexican heraldry of these rules is a key to the art of heraldry. This system was adapted to Mexican society by incorporating flora and fauna native to Mexico. Another conspicuous difference between Mexican heraldry and European heraldry is the absence of a helm surmounting the shield. Most traditions of Mexican heraldry came from Hispanic or Spanish origin from regions in Spain or Portugal, predominating heraldry of Castilian, Basque or Galician, in second place heraldry of Catalan and Valencian origin. Other common heraldic traditions in Mexico came from French, Italian, German and Polish origins. The most recent heraldic influences, since 1943, are of