Coccydynia, commonly called tailbone pain or coccyx pain, is a fairly rare and relatively poorly understood condition that can cause persistent pain at the very bottom of the spine. This part of the spine is the coccyx, or tailbone.
Grazing is a method of feeding in which a herbivore feeds on plants such as grasses, or other multicellular organisms such as algae. In agriculture, grazing is one method used whereby domestic livestock are used to convert grass and other forage into meat, milk and other products. Many small selective herbivores follow larger grazers, who skim off the highest, tough growth of plants, exposing tender shoots.
A herd is a social grouping of certain animals of the same species, either wild or domestic. The form of collective animal behavior associated with this is referred to as herding. The term herd is generally applied to mammals, and most particularly to the grazing ungulates that classically display this behaviour.