code: protected static CowFace getByMode(final String mode) {
  		if (mode != null) {
  			return COW_MODES.get(mode);
  		}
  		return null;
  	}
docs: Get cow args by mode.
  @param mode A mode key, "b" for Borg, "d" for dead, "g" for greedy etc
  @return The CowArgs for the given mode or null if not found