Read this classical series:
Substance → body → growing body → animal → human
Substance: highest genus; no higher genus in the series.
Body: intermediate genus; substance above, growing body below.
Growing body: intermediate genus; body above, animal below.
Animal: lowest genus; a genus above, species such as human below.
Human: in this series a real and relative species, not a further genus.
The hierarchy reflects the source's classical logical classification.