Final answer:
Leonardo da Vinci's main love, besides art and inventing, was botany, which is evidenced by his extensive botanical studies and drawings.
Step-by-step explanation:
Among Leonardo da Vinci's various interests beyond art and inventing, one of his main loves was botany. While da Vinci is admired as a scientist, academic, and inventor, and is most famous for his achievements as the painter of several Renaissance masterpieces, his passion for the natural world extended to many domains. For example, his detailed anatomical drawings were not limited to human figures but also included numerous plant studies. Leonardo's curiosity about the mechanics of the natural world drove him to investigate plant life and even theorize about geological phenomena based on his botanical observations.