I love hummingbirds! In undergrad I spent a summer working on a research project that was trying to determine if hummingbirds have persistent gut microflora. The bird's metabolism is so fast that it's unclear whether any microbes have enough time to colonize. Every weekend I'd tag along with a group of veterinary post docs who were doing their own hummingbird study. They caught and safely handled the birds and I waited patiently nearby to collect their droppings basically straight from the cloaca. Once, when the vets were done getting their measurements, they put a bird in my hand to release. My hand could barely register that I was holding anything it was so light.