sound FX also used in "Jonny Quest"
I'm pretty sure some of the sounds used in the Ymir/elephant battle were also used, in slightly edited form, for Turu the pteranodon in "Jonny Quest":
http://www.tcm.com/mediaroom/video/200969/20-Million-Miles-to-Earth-Movie-Clip-Elephant.html
https://www.youtube.com/watch?v=DKk-Tzwuj7k