This is an excellent walker from Star Wars.  LEGO Star Wars 75054 AT-AT Building Toy: http://www.amazon.com/gp/product/B00J4S9BEA/ref=as_li_tl?ie=UTF8&camp=211189&creative=373489&creativeASIN=B00J4S9BEA&link_code=as3&tag=wwwtoystore0a-20&linkId=H5JL7PPSDDASTP72