by Elio — If you were a fun­gus grow­ing on dung and if, for prop­a­ga­tion, you de­pended on hav­ing your spores in­gested by an an­i­mal, you'd have a prob­lem. Few an­i­mals graze near their poop. The so­lu­tion would be to evolve a pow­er­ful dis­charge mech­a­nism that en­sured that your spores trav­eled far afield.