Butterflies must like me. A week ago I attracted one with my hat. Last Saturday while hiking along the C&O Canal down by the Potomac river, this beautiful Hackberry Emperor (Asterocampa celtis) developed a more intimate interest in me. First it landed on my shorts, then on my shirt and finally on my left hand. Luckily, I hold the camera in my right hand and was able to take a series of close-ups of it (I am ambidextrous; I write with my left hand, but do many other things with my right hand).
As you see in the above photo, the butterfly had its proboscis uncurled and was constantly probing with it around the tip of my finger and along my nail. Obviously, there was something there that it was after. Sweat, maybe? Today, I remembered that before I had left home about an hour earlier, I had sprayed cologne on my shirt (I always operate the spray bottle with my left hand). Perhaps, the sensitive receptors on the butterfly's proboscis could detect the few molecules of perfume that were still on my skin.