Late in the film Thor: The Dark World, we see a large creature on Jotunheim (possibly the same species as the extremely large creature that Thor killed on Jotunheim in Thor?). It's large, and has horns.
In Avengers, Thor describes a fictional creature, the Bilgesnipe:
Thor: We on Asgard pretend that we are more advanced, but we, we come here battling like Bilgesnipe.
Agent Coulson: Like what?
Thor: The Bilgesnipe, you know; huge, scaly, big antlers. You don't have those?
Agent Coulson: Don't think so.
Thor: They are repulsive, and they trample everything in their path.
Was this creature a Bilgesnipe? It at least partially matches the description from Avengers.
Note: I'm looking for information from the Marvel Cinematic Universe's canon.