A bachelor herds is a gathering of (usually) juvenile male animals who are still sexually immature, or of 'harem'-forming animals who have been thrown out of their parent groups but not yet formed a new family group.
Examples include seals, dolphins, lions, and many herbivores such as deer and horses. Pinnipeds ("fin-feet" lit "winged feet" or fin-footed mammals are a widely distributed and diverse group of semi-aquatic marine Mammals comprising Dolphins are Marine mammals that are closely related to Whales and Porpoises There are almost forty species of dolphin in seventeen genera. The lion ( Panthera leo) is a member of the family Felidae and one of four Big cats in the Genus Panthera. Herbivory is a form of Predation in which an Organism, known as a herbivore, consumes principally Autotrophs ref name=Campbell>Campbell A deer is a Ruminant Mammal belonging to the family Cervidae. The horse ( Equus caballus) is a hoofed ( Ungulate) Mammal, one of eight living species of the family Equidae. Bachelor herds are thought to provide useful protection for social animals against more established herd competition or aggressive dominant males. Males in bachelor herds are sometimes closely related to each other.
In many species, males and females move in separate groups, often coming together at mating time, or to fight for territory or mating partners. In many species it is common for males to leave or be driven from the group as they mature, and they may wander as lone animals or form a bachelor group for the time being. This arrangement may be long term and stable, or short term until they find a new group to join.