I just picked up both the Target-exclusive Tauntauns on clearance, and it got me thinking about how just about every tauntaun we meet in Empire gets killed.
1) Luke's Tauntaun is killed by a Wampa.
2) There's that dead Tauntaun in Echo Base that 2-1B is examining that we never learn got killed by another Wampa.
3) Han's Tauntaun dies of freezing temperatures and exhaustion, I assume, as it just plops down dead despite being native to Hoth.
4) Darth Vader just offscreen kills all the other Tauntauns in Echo Base with a combination of lightsaber throws and Force chokes.
That last one only happened in my imagination, but I think there's only 1 other on-screen Tauntaun at all and he's in the background. We never see these majestic snow-lizard steeds during the battle, and it seems unlikely that the Rebellion took them with when they evacuated.
So it's hard out here for a Tauntaun.