We have a lot of hummingbirds here but they're only just arriving this year. Well, maybe they are here year round but I have no idea what the do in the winter. They spend a lot of effort fighting over our trumpet vine bushes once those flowers open up. It's still a bit early for that. The one thing I do know is those Bougainvillea are very sharp! 20+ years ago I had to prune a ladies giant shrub in San Luis Obispo and I left that job bleeding. Thanks for sharing the picture!!!