Tending bots

'Tending Bots' is a generic term for robots that are used for herding and taking care of livestock. While there are hundreds of models of Tending  bots, these can be grouped into the following categories.
 * Aquatic - Used to tend and herd schools of aquatic creatures.
 * Amphibian - used for herds that spend a significant portion of the time in the water, but also spend time on dry land.
 * Herdbot - mostly used to herd land livestock, although it also provides some protection.  These traditionally have had the form of certain breeds of Terran dogs.
 * Shepardbot - Used to herd land livestock as well as to feed and protect them.  These often have a shape similar to the centaurs of Terran mithology and fiction.