I spoke to an ornithologist and bird feeder expert about their experiences making DIY bottle bird feeders ... I recommend ...

Once cooled, pour the nectar into the Mason jar, and insert the plastic circle in the lid with the hanging chain. Screw the lid onto the jar, and hang the feeder from a sturdy branch on a tree or ...

As with any bird feeder, plastic bottle feeders can be cleaned with warm, soapy water. This type of feeder won't last forever, however, and should be replaced every so often. This prevents a build-up ...