Originally Posted by Jabbas WhOr3
As per the www.starwars.com
databanks say, a fully grown rancor can get to 10m tall while an AT-AT is listed at 15.5M. So there is a possibilty that it could inflict some damage, but I think that the laser cannons on the AT-AT would blow that thing to bits in one hit.
That listing is incorrect.
According to the movies themselfs they appear to be around 23 meters tall.