I think [MENTION=99817]chaochou[/MENTION] gave the best advice on this upthread - it depends how you and your group see the world and want to handle it. And also on what you're comfortable with as GM.So I guess it just depends on how you define, "animal". That's a tough one. Just because a creature doesn't exist in our reality doesn't mean it's not an animal indigenous to another planet/plane/reality.
Would you just draw the line at Earth creatures and be done with it?
I don't think there's a mechanical answer.
Again, I think this is up to the GM and the fiction. If the elephant is charging down a narrow canyon, "You crush the goblins - they're dead" seems to make sense. If the elephant is charging the goblins on an open plain, and so they might scatter, fall down, etc, then rolling damage seems reasonable.So then are we rolling for that damage? If so, we still only roll the druids damage dice (d6 for starters). I was beginning to believe that the effect of a given animal move was left up to the GM. In other words, if a druid/elephant spent a hold to trample an enemy I might say, "You crush the goblin under your heavy feet." and the goblin is dead. No damage roll required. But are you saying that the proper response would be, "You crush the goblin under your heavy feet. Roll a d6 for damage."?
Again, I don't think there is a mechanical answer to this.
In all cases, I strongly encourage working this out with the group - having everyone's buy in is more important, I think, then getting it right in technical terms.