According to the Prose Edda, one of these called Saehrimnir is killed and eaten every night by the inhabitants of Valhalla.
In Beowulf, it is said that one of these animals adorned the helmet of Onela, supposedly to protect the life of its wearer; that effigy represented Hildisvini, which was sometimes used as a mount by Freya.  In Hindu mythology, this creature represents the third avatar of Vishnu, Varaha. In Norse mythology, Eitri and Brokkr fashioned a (*) golden one of these creatures named Gullinbursti. According to the Prose Edda, one of these called Saehrimnir is killed and eaten every night by the inhabitants of Valhalla. In Greek mythology, Adonis was killed by one of these creatures, Heracles drove one of them into a patch of snow as one of his labours, and one of them sent by Artemis was wounded by Atalanta and killed by Meleager. For 10 points, name this animal that came in Erymanthean and Calydonian varieties.
In Beowulf, it is said that one of these animals adorned the helmet of Onela, supposedly to protect the life of its wearer; that effigy represented Hildisvini, which was sometimes used as a mount by Freya.  
{boar}s [prompt on pigs]