Biomechanics is the application of mechanical principles to biological systems.

Bioships differ from other types of spacecraft in that they are composed, either predominantly or totally, of biological components, rather than being constructed from manufactured materials. Because of this, they nearly always have a distinctively organic look.

Bioships are usually quite powerful, and can often regenerate or heal damaged parts. Some bioships are intelligent or sentient, and some are considered to be lifeforms. Like most organic beings, many bioships contain large amounts of "scaffolding" materials to keep their shape, such as the xylem in trees or bone and chitin in animals.