The tiniest bird! I've never seen a newborn humming bird and I'm not even sure how I would feed something so impossibly small. We usually get only a few fledglings or injured adults in per year. It's harder to describe their personality since I have less data, but it's safe to say they can certainly be diffcult. You physically can't force feed them since they're so small, you just have to hope they'll eat. We give them sugar water and a nutrient-packed humming bird food mix out of special syringes that look like flowers (AKA we cut the tip off and paint the edges red). The juvinelles have to learn not to open their mouths like they would accepting food from their parants, which is quite cute. They just try to eat the whole syringe despite it being wider than their entire head. Once they grow up a bit and get better at flying, an escaped humming bird is even worse than a wren. They're fast, unpredictable, and so small they can hide just about anywhere. Most of those I've cared for have been fairly content to stay in their cage. They get special little mesh tents or baskets since they'd slip out through the bars of larger cages. We put humming bird feeders, similar to the kind you'd put in your hard, in there too to help them learn how to eat on their own. Cute fairy birds.