text: Olaf I used one of these animals to execute Raud the Strong.
full_question: Olaf I used one of these animals to execute Raud the Strong. One of these animals was baited using the head of a pack animal nicknamed “the heaven breaker.” Utgard-Loki disguised one of these animals as a cat, rendering Thor unable to lift the feline from the ground. A liquid secreted by one of these animals drips onto Loki’s face as part of his eternal punishment. Thor used the head of one of Hymir’s oxen to bait one of these animals from the ocean. For 10 points, name these animals, one of which named Jormungandr encircles the world in Norse myth.
first_sentence: Olaf I used one of these animals to execute Raud the Strong.