Ants make up a very large portion of the diet of a trout during the summer months along with other terrestrials such as beetles and inchworms. A random caddis may find its way into the maul of a big brown as well but by and large the bulk of the biomass available to summer trout is in the form of an ant.  Trout seem to have a strong affinity for these little formic acid filled sour treats.  Ive been told they like the acidic taste, but Im more inclined to believe its the availability and helplessness of the food form that lends to such a sustained sight picture in the mind of summer trout.  

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