This bottom-fill hummingbird feeder has an interesting twist to it. At night, the reservoir and sugar solution automaticaly light up in a cool color changing light show. It has a rechargeable battery in the cap that is solar-charged. I like that I can peek out the window at night after work - see the light show and see if I need to refill the feeder for the next day. The reservoir is plastic but the manufacturer has a glass version. Quite easy to clean with a wide mouth on the reservoir. I got mine at http://www.solascape.com