A Portuguese man o' war is a colony pretending to be one animal
The Portuguese man o' war looks like a single jellyfish, but it is really a colonial organism: many connected individuals, each specialised for tasks such as feeding, reproduction or defence, sharing nutrients through their living links. Such partnerships may even have been the first evolutionary step toward multicellular life.
In biology, a colony is any group of two or more individuals of one species living in close association or physically joined, usually because togetherness brings better defence or access to bigger prey. Jaguars sit at the opposite extreme, solitary animals equipped to survive and reproduce alone. Some creatures form colonies only when conditions demand it, such as certain carpenter bees when rival nest founders settle into a hierarchy. Others cannot live any other way; corals are bound together by shared living tissue and a common digestive cavity.
Colonies come in many forms. Slime molds, normally single cells, gather together when food runs short because a crowd responds better to chemical cues from prey. Birds and mammals form breeding colonies to protect their young. Bracken Cave in Texas hosts around 20 million Mexican free-tailed bats each summer, the largest known concentration of mammals. Ants and honey bees go further, organising societies so tightly integrated that some are considered superorganisms.
Such insect colonies have a life story of their own. A founding queen, or a small group of them, builds a first nest and may even forage and nurse the earliest eggs herself. Her first workers take on general chores, and specialisation increases as the colony grows. Eventually the colony raises new queens and males to found colonies elsewhere, before aging and declining. When the queen dies, a virgin queen or even a worker may take over reproduction.
Modular organisms add another twist: a single genetic individual can clone itself into many copies called ramets, like plants spreading by runners or anemones budding from torn-off tissue. Asexual reproduction saves energy for growth and repairing losses. Microbiologists exploit clonal colonies too, starting pure laboratory strains from one colony grown from a single cell.
Source: Colony (biology)
