A traditional and very useful pattern, the Hares Ear can be tied to suggest many different species of nymphs.
The Hares Ear can be tied weighted or unweighted. A beadhead works well, too. Dark brown is the most productive body color; dark olive and tan can also work well. Feel free to vary the body color to match different species, but be sure to compare the color of wet dubbing to the natural (and wet) insect.
Some anglers use peacock herl for the thorax.
For a Poxyback Hares Ear, coat the wingcase with epoxy. For an explanation of this style (and the reasons for it) see the Poxyback Green Drake.
A Gold Ribbed Hares Ear can imitate some species of blue-winged olive nymphs. The gold ribbing mimics some abdominal segments which are light colored. Keep the fly sparse.
How to Fish
HOOK: 5262 or 3761, sizes 8-18
THREAD: Brown or black
TAIL: Hares mask guard hairs
RIB: Gold mylar tinsel or copper wire
ABDOMEN: Blended hares ear; keep it thin
WINGCASE: Turkey tail coated with Flexament
THORAX: Same as abdomen. After tying, pick out a few hairs so they look like legs