Many of the multiple-flash hummingbird images from Costa Rica that you see on the web (including here at 500px.com) were taken at my setups by people who have come to learn this technique with me. If you're interested, check out the tours on my websites -- www.deepgreenphotography.com and www.fotoverdetours.com.
This technique and many more are described in my new e-book The Guide to Tropical Nature Photography. Check it out here! http://www.theguidetotropicalnaturephotography.com