folio volume descriptions species comparison skeleton humans birds considered landmark comparative anatomy ref name miall ref volcher coiter dutch anatomist made detailed studies internal structures birds produced classification birds ''de differentiis avium'' around based structure habits ref name egallen ref konrad gesner wrote ''vogelbuch'' ''icones avium omnium'' around like gesner ulisse aldrovandi encyclopedic naturalist began volume natural history three volumes birds entitled ''ornithologiae hoc est de avibus historiae libri xii'' published
Natural science Biology Zoology Ornithology