Final answer:
Leonardo da Vinci's avid interest in the natural world manifested in one of his main loves: botany. His extensive botanical studies are captured in his notebooks, showcasing both his scientific and artistic brilliance.
Step-by-step explanation:
One of Leonardo da Vinci's main loves besides art and inventing was botany. Leonardo's fascination with the natural world drove him to study plants extensively, carefully observing and recording their structure in his notebooks. His detailed botanical drawings demonstrate his scientific approach as well as his artistic skill. In addition to botany, da Vinci's interests spanned a multitude of areas, evidenced by his contributions to anatomy, engineering, and the natural sciences. His insatiable curiosity and ability to see the interconnectedness of different disciplines personify the essence of the Renaissance man.