The venom of the black widow spider contains poisonous chemicals that make people sick. Black widows are found throughout the United States, mostly in the South and West. They are usually found in barns, sheds, stone walls, fences, woodpiles, porch furniture, and other outdoor structures.
Some types of grass hay, in dry weather conditions or on dry ground, will be much too dry when baled as small bales using the eight to 15 percent moisture (the traditional rule of thumb) as a guide. Some of this grass hay produces the best quality bales when baled at 24 to 30 percent moisture.
Bales can vary from 30 to 150 lbs. You need to weigh them.   Most 1000 pound horses should be given about 15 to 20 pounds of grass hay a day, if this is their only source of roughage (as with stalled horses). So with a normal 50 pound bale, that just under half a bale.