User blog comment:Lightning the Skrill/Skrill's Lightning Blast; White Fire?/@comment-24413325-20150326130009/@comment-24413325-20150326163003

I know Thunderdrum was in Book of dragons, but if you look at the (just an example) : HTTYD 2 ones, they have smaller legs than Thornado. It was also mentioned in "Evolution of Thunderdrum", that in the series, they placed thornado's leg lower and they made it longer, because *it couldn't touch the ground*