Like, you can see a leaf on and think “wow, that’s a beautiful leaf”. You may even pick it up to admire it (especially if you’re a child or a biologist). You wouldn’t do that with a strand of human hair, a human nail clipping, or even less with the parts that aren’t supposed to come off like hands or eyes.
A human might not, but you have to wonder if Treebeard was cruising round Isengard after the battle collecting arms and legs of the dunlendings for his vase on his dinner table back home.