https://i.vimeocdn.com/video/1939813671-22a77bf82a961711f66966a673855537b7d84b5d75ed5a5bf232e7992994c34c-d

Vacuum Insulated Hummingbird Feeders

Keep your nectar fresh for longer. Moldy and infected nectar can make hummingbirds sick. 

Also delays nectar from freezing.