Along with the landscape set, a set of stamps showing the wildlife of Tuva was also released in March 1935.  This is the set that my dad had in his collection, and that first hooked me on philately.  Those upside-down triangles fascinated me!

(yeah, there's too many graphics on this page, but I really do love this set :-)

Given my love of philately, I consider these the most expensive stamps of my life...