Rattlesnakes everywhere

In the last week we have killed 4 rattlesnakes, 3 of them right around our shed and one in a chicken yard. The one killed (we hope) under the shed has been there for weeks, rattling away whenever there was any activity around the recycling barrels but staying back where he couldnt be reached with a shovel.. Dh finally got tired of it, and shot the .410 under there twice, silencing him the second time. Hopefully that is the end of the problem, although they probably hatched a whole nest of them under there and this will keep happening for years. Perish the thought!